Scheelite-like compounds antimony fluoborate and antimony fluoborate multifunctional crystals and methods of preparation and use

Abstract

This invention provides a scheelite-like compound, antimony fluoroborate, and a multifunctional crystal of antimony fluoroborate, along with their preparation methods and applications. The compound has the chemical formula SbBO₂F₂ and a molecular weight of 202.56, and is prepared using a vacuum tube sealing method or a hydrothermal method. The crystal has the chemical formula SbBO₂F₂, a molecular weight of 202.56, belongs to the monoclinic crystal system, and its space group is [space group number missing]. C 2 / c The unit cell parameters are a = 6.3036(5) Å, b = 12.2182(10) Å, and c = 4.5611(4) Å. α = gamma =90°, β =122.261(3)°, unit cell volume is 297.06(4) Å. 3 It exhibits a birefringence of 0.22 at 1064 nm, a large band gap, and an ultraviolet absorption edge of approximately 215 nm. The crystal is grown using vacuum tube sealing or hydrothermal methods. It possesses good chemical stability and can be used as a polarizing beam splitter or optical element in the infrared-visible-ultraviolet bands, finding applications in all-solid-state lasers.

Description

Technical Field

[0001] This invention relates to a scheelite-like compound, antimony fluoroborate SbBO2F2, and a multifunctional crystal of antimony fluoroborate SbBO2F2, as well as its preparation method and uses. Background Technology

[0002] Birefringent materials in the ultraviolet and deep ultraviolet bands play an irreplaceable role in controlling the polarization characteristics of light waves, thus becoming key components of many core optical devices, including optical isolation devices, ring couplers, polarization beam splitters, polarization generators, and phase modulation components. Researchers have identified a variety of birefringent crystalline materials, such as magnesium fluoride, low-temperature barium metaborate, lithium niobate crystals, yttrium vanadate single crystals, calcium carbonate crystals, and titanium dioxide crystals. However, these materials all have significant performance limitations: for example, magnesium fluoride, despite having a wide spectral transmission window, has a low birefringence, making it difficult to meet the manufacturing requirements of Gran-Thompson prisms, limiting its application to Lochtein prism structures, and its limited beam deflection angle results in bulky devices, restricting practical applications. Niobium-based oxides (such as lithium niobate), rutile titanium dioxide, and yttrium vanadate have high ultraviolet absorption edges, making them unsuitable for optical systems in the deep ultraviolet to ultraviolet spectral regions. Natural calcite crystals have significant defects, including complex artificial synthesis processes, difficulties in growing large single crystals, and pronounced cleavage characteristics. While low-temperature barium metaborate crystals offer the advantages of a wide light transmittance range and high birefringence, they are prone to deliquescence, have a phase transition temperature, and are susceptible to cracking defects during crystal growth. These factors limit their practical applications.

[0003] Fluoride solid electrolytes, with their high ionic conductivity and low Young's modulus, have become a key research focus in the solid-state battery industry. Most materials expand upon heating due to increased atomic vibrations, a traditional characteristic caused by anharmonic lattice vibrations. However, materials with negative thermal expansion shrink upon heating; this anomalous behavior is significant for the design of precision instruments, electronic devices, and composite materials. Currently, the international scientific community continues to focus on the development of novel multifunctional crystal materials, emphasizing not only the optical and mechanical properties of crystals but also increasingly the fabrication characteristics.

[0004] In previous research, this invention has resulted in four related patents: a large-size guanidinium tetrafluoroborate birefringent crystal and its growth method and uses (patent application number: 202211670253.0); a compound lithium aluminum borate sodium and a compound lithium aluminum borate sodium birefringent crystal and their preparation method and uses (patent application number: 202210144800.5); a compound zinc barium borate and a compound zinc barium borate birefringent crystal and their preparation method and uses (patent application number: 202211151807.6); and a compound hydroxyammonium fluoride borate ammonium and a compound hydroxyammonium fluoride borate ammonium birefringent crystal and their preparation method and uses (patent application number: 202310154647.9). The main difference between this invention and the above four patents is that the scheelite-like compound antimony fluoroborate SbBO2F2 possesses multiple functional properties. Structurally, in antimony fluoroborate SbBO2F2, the boron-oxy-fluorine anion framework exists in an isolated form, and the Sb ion is connected to the boron-oxy-fluorine anion framework by Sb-O ionic bonds. The different bonding forces in the structure lead to completely different structures and growth habits. Antimony fluoroborate SbBO2F2 can grow stably in a closed system, and the key parameters of the growth process and crystal properties are different from the previous four crystals. Summary of the Invention

[0005] The purpose of this invention is to provide a scheelite-like compound, antimony fluoroborate, with the chemical formula SbBO2F2 and a molecular weight of 202.56, prepared by a vacuum tube sealing method.

[0006] Another object of the present invention is to provide a multifunctional crystal of antimony fluoroborate (SbBO₂F₂), with the chemical formula SbBO₂F₂ and a molecular weight of 202.56. Its crystal structure belongs to the monoclinic system, with space group C2 / c and cell parameters of [missing information]. α=γ=90°, β=122.261(3)°, unit cell volume is It has a birefringence of 0.22 at 1064 nm and a short ultraviolet cutoff edge of 215 nm.

[0007] Another objective of this invention is to provide a method for preparing antimony fluoroborate SbBO2F2 multifunctional crystals, using a flux method or a hydrothermal method to grow the crystals.

[0008] Another object of the present invention is to provide the use of antimony fluoroborate SbBO2F2 birefringent optical crystals.

[0009] Another object of the present invention is to provide the use of antimony fluoroborate SbBO2F2 solid electrolyte, which has a conductivity of 1.53 × 10⁻⁶ at room temperature. -6 S·m -1 .

[0010] Another objective of this invention is to provide antimony fluoroborate (SbBO2F2) multifunctional crystals for use as thermal expansion materials, wherein the coefficients of thermal expansion along the X1, X2, and X3 directions are 26.4044 × 10⁻⁶. -6 K -1 -3.8245×10 -6 K -1 24.6589×10 -6 K -1 Furthermore, it exhibits negative thermal expansion in the X2 direction.

[0011] Another objective of this invention is to provide the use of antimony fluoroborate SbBO2F2 multifunctional crystal photocatalytic element.

[0012] The present invention discloses a scheelite-like compound, antimony fluoroborate, with the chemical formula SbBO2F2 and a molecular weight of 202.56, which is prepared by vacuum sealing method.

[0013] The preparation method of the compound antimony fluoroborate is carried out by vacuum sealing method, and the specific operation is as follows:

[0014] The vacuum sealing method was used to prepare the compound antimony fluoroborate.

[0015] Mix Sb-containing compounds and B-containing compounds with a purity ≥ 99% thoroughly in a molar ratio of Sb:B = 1:1, and pack the mixture into a quartz tube. Evacuate the quartz tube to a vacuum level of 1 × 10⁻⁶. -3 After being sealed at high temperature, the sample is placed in a muffle furnace and heated to 200-250℃ at a rate of 5-10℃ / h, and held at that temperature for 24-120 hours to obtain a polycrystalline powder sample of compound SbBO2F2. The Sb-containing compounds are SbF3, Sb2O3, and SbOF; the B-containing compounds are H3BO3, B2O3, and HBO2.

[0016] A multifunctional antimony fluoroborate crystal with the chemical formula SbBO₂F₂, a molecular weight of 202.56, belongs to the monoclinic crystal system, has a space group of C² / c, and a unit cell parameter of [missing information].

[0017] α=γ=90°, β=122.261(3)°, unit cell volume is

[0018] The preparation method of the aforementioned antimony fluoroborate multifunctional crystal involves growing the crystal using either a flux method or a hydrothermal method.

[0019] The flux method for growing antimony fluoroborate multifunctional crystals is carried out according to the following steps:

[0020] a. Mix Sb-containing compounds and B-containing compounds with a purity ≥ 99% uniformly in a molar ratio of Sb:B = 1:1, pack the mixture into a quartz tube, seal it at high temperature, and place it in a muffle furnace. Heat the mixture to 200-250℃ and hold it at that temperature for 24-120 hours to obtain polycrystalline powder of compound SbBO2F2. The Sb-containing compounds are SbF3 and Sb2O3; the B-containing compounds are H3BO3, B2O3, and HBO2.

[0021] b. Mix the polycrystalline SbBO2F2 obtained in step a with a flux at a molar ratio of 1:0.1-1 until homogeneous, pack the mixture into a quartz tube, seal it at high temperature, place it in a muffle furnace, heat it to 220-270℃, hold it at that temperature for 72-120 hours, then cool it down to 180℃ at a rate of 0.1-3℃ / h, and then rapidly cool it down to room temperature at a rate of 5-10℃ / h to obtain SbBO2F2 multifunctional crystals. The flux is H3BO3 or HBO2.

[0022] The hydrothermal growth of antimony fluoroborate multifunctional crystals is carried out according to the following steps:

[0023] a. Mix Sb-containing compounds and B-containing compounds with a purity ≥ 99% uniformly in a molar ratio of Sb:B = 1:1, pack the mixture into a quartz tube, seal it at high temperature, and place it in a muffle furnace. Heat the mixture to 200-250℃ and hold it at that temperature for 24-120 hours to obtain polycrystalline powder of compound SbBO2F2. The Sb-containing compounds are SbF3 and Sb2O3; the B-containing compounds are H3BO3, B2O3, and HBO2.

[0024] b. Dissolve the polycrystalline SbBO2F2 compound obtained in step a in ethanol. Treat the incompletely dissolved mixture with ultrasound at 60°C to ensure it is fully mixed and dissolved. Then adjust the pH value to 3-6 with HF or HBF4.

[0025] c. Transfer the mixed solution obtained in step b into the liner of a clean, uncontaminated 100 mL high-pressure reactor, and tighten and seal the reactor.

[0026] d. Place the high-pressure reactor in a constant temperature chamber, heat it to 180-220℃, keep it at that temperature for 5-8 days, and then cool it down to room temperature at a rate of 5-20℃ / day to obtain SbBO2F2 multifunctional crystals.

[0027] The antimony fluoroborate multifunctional crystal is used in the preparation of polarizing beam splitters or optical elements in multiple bands of infrared, visible and ultraviolet light.

[0028] The optical elements mentioned are polarization beam splitters, optical isolators, circulators, beam shifters, optical polarizers, optical analyzers, optical polarizers, optical modulators, polarization beam splitters, phase delay devices, or electro-optic modulators.

[0029] The antimony fluoroborate multifunctional crystal has an electrolyte material application in the preparation of solid-state batteries, sensors, and microdevices, with a conductivity of 1.53 × 10⁻⁶ at room temperature. -6 S·m -1 .

[0030] The antimony fluoroborate multifunctional crystal is used in the preparation of thermal expansion materials for thermal components in low-temperature infrared detection and electronic packaging, wherein the coefficients of thermal expansion of the material along the X1, X2, and X3 directions are 26.4044 × 10⁻⁶. -6 K -1 -3.8245×10 -6 K -1 24.6589×10 -6 K -1 Furthermore, it exhibits negative thermal expansion in the X2 direction.

[0031] The antimony fluoroborate multifunctional crystal is used in the preparation of photocatalytic elements for environmental purification and pollution control, energy conversion and storage, and industrial and chemical synthesis.

[0032] Antimony fluoroborate, as a good solid-state electrolyte material, can be used in solid-state batteries, sensors, and micro-devices. It can also serve as a negative thermal expansion material, possessing significant application value in precision instruments, aerospace, and electronic devices. It can be used in low-temperature infrared detection and thermal components for electronic packaging. As a photocatalyst, it can convert low-energy-density sunlight into high-energy-density chemical or electrical energy, which can be used to assist fuel cells, organic synthesis, and the chemical industry. A solid-state electrolyte of antimony fluoroborate is also provided, with a conductivity of 1.53 × 10⁻⁶ at room temperature. -6 S·m -1 .

[0033] The preparation method of the antimony fluoroborate multifunctional crystal of this invention uses quartz tubes, conical flasks, beakers, and hydrothermal reactors lined with polytetrafluoroethylene or stainless steel with platinum sleeves as containers. When the container is a quartz tube, a vacuum must be applied before sealing to prevent the quartz tube from cracking due to the volatilization of raw materials during the reaction. When the container is a conical flask or beaker, it must first be cleaned with acid, then rinsed with deionized water, and then dried.

[0034] The method for preparing the antimony fluoroborate multifunctional crystal of the present invention uses a muffle furnace or a drying oven in the preparation process.

[0035] This invention provides a multifunctional antimony fluoroborate crystal with a birefringence of 0.22 at 1064 nm and an ultraviolet absorption edge of approximately 215 nm. It is grown using a flux method or a hydrothermal method, which offers advantages such as simple preparation, short growth cycle, low toxicity of raw materials, and stable physicochemical properties.

[0036] The antimony fluoroborate multifunctional crystal of this invention can be used as an ultraviolet multifunctional crystal in all-solid-state lasers, and can also be used to fabricate polarization beam splitters, phase delay devices, and electro-optic modulation devices. Attached Figure Description

[0037] Figure 1 The XRD pattern of the compound SbBO2F2 prepared in this invention;

[0038] Figure 2 This is a schematic diagram of the structure of the SbBO2F2 multifunctional crystal of the present invention;

[0039] Figure 3 This is a schematic diagram of the Glan prism in the SbBO2F2 birefringent optical crystal of the present invention;

[0040] Figure 4 This is a schematic diagram of the Wollaston prism in the SbBO2F2 birefringent optical crystal of the present invention;

[0041] Figure 5 This is a schematic diagram of the wedge-shaped multifunctional crystal polarization beam splitter in the SbBO2F2 birefringent optical crystal of the present invention;

[0042] Figure 6 This is a schematic diagram of the optical isolator in the SbBO2F2 birefringent optical crystal of the present invention;

[0043] Figure 7 This is a schematic diagram of the beam shifter in the SbBO2F2 birefringent optical crystal of the present invention;

[0044] Figure 5 In 6 and 7, 1 is the incident light, 2 is the o-ray, 3 is the e-ray, 4 is the optical axis, 5 is the SbBO2F2 crystal, 6 is the transmission direction, and 7 is the optical axis plane.

[0045] Figure 8 This is a schematic diagram of the ionic conductivity in the SbBO2F2 solid electrolyte of the present invention;

[0046] Figure 9 This is a schematic diagram showing the change in the axial length of the SbBO2F2 negative thermal expansion crystal of the present invention. Detailed Implementation

[0047] The present invention will be further described below with reference to embodiments. It should be noted that the following embodiments are not intended to limit the scope of protection of the present invention, and any improvements made based on the present invention do not depart from the spirit of the present invention. Unless otherwise specified, the raw materials or equipment used in the present invention are commercially available.

[0048] Example 1

[0049] Preparation of compounds:

[0050] According to the reaction formula: SbF3 + H3BO3 → SbBO2F2 + H2O + HF, compound SbBO2F2 was synthesized using the vacuum tube sealing method.

[0051] Weigh out 1g of a mixture of SbF3 and H3BO3 at a molar ratio of 1:1 and place it into a Φ40mm quartz tube. Evacuate the quartz tube to a vacuum level of 1×10⁻⁶. -3 After being sealed at high temperature, the mixture was placed in a muffle furnace and heated to 200°C at a rate of 5°C / h. The temperature was then maintained for 24 hours to obtain polycrystalline powder of compound SbBO2F2.

[0052] Example 2

[0053] Preparation of compounds:

[0054] According to the reaction formula: SbF3 + HBO2 → SbBO2F2 + HF, compound SbBO2F2 was synthesized using the vacuum tube sealing method.

[0055] Weigh out 1g of a mixture of SbF3 and HBO2 at a molar ratio of 1:1 and place it into a Φ40mm quartz tube. Evacuate the quartz tube to a vacuum level of 1×10⁻⁶. -3 After being sealed at high temperature, the mixture was placed in a muffle furnace and heated to 210°C at a rate of 8°C / h. The temperature was then maintained for 36 hours to obtain polycrystalline powder of compound SbBO2F2.

[0056] Example 3

[0057] Preparation of compounds:

[0058] According to the reaction formula: SbOF + SbF3 + 2HBO2 → 2SbBO2F2 + H2O, compound SbBO2F2 was synthesized using the vacuum tube sealing method.

[0059] Mix SbOF, SbF3, and HBO2 in a molar ratio of 1:1:2 until homogeneous. Weigh out 1g of the mixture and place it into a Φ40mm quartz tube. Evacuate the quartz tube to a vacuum level of 1×10⁻⁶. -3 After being sealed at high temperature, the mixture was placed in a muffle furnace and heated to 240°C at a rate of 10°C / h. The temperature was then maintained for 120 hours to obtain polycrystalline powder of compound SbBO2F2.

[0060] Example 4

[0061] Preparation of compounds:

[0062] According to the reaction formula: Sb₂O₃ + 4SbF₃ + 6HBO₂ → 6SbBO₂F₂ + 3H₂O, compound SbBO₂F₂ was synthesized using the vacuum tube sealing method.

[0063] Weigh out 1g of a mixture of Sb₂O₃, SbF₃, and HBO₂ in a molar ratio of 1:4:6, and place it into a Φ40mm quartz tube. Evacuate the quartz tube to a vacuum level of 1×10⁻⁶. -3 After being sealed at high temperature, the mixture was placed in a muffle furnace and heated to 230°C at a rate of 8°C / h. The temperature was then maintained for 96 hours to obtain polycrystalline powder of compound SbBO2F2.

[0064] Example 5

[0065] Preparation of compounds:

[0066] According to the reaction formula: SbOF + SbF3 + 2H3BO3 → 2SbBO2F2 + 3H2O, compound SbBO2F2 was synthesized using the vacuum tube sealing method.

[0067] Mix SbOF, SbF3, and H3BO3 in a molar ratio of 1:1:2 until homogeneous. Weigh out 1g of the mixture and place it into a Φ40mm quartz tube. Evacuate the quartz tube to a vacuum level of 1×10⁻⁶. -3 After being sealed at high temperature, the mixture was placed in a muffle furnace and heated to 250°C at a rate of 5°C / h. The temperature was then maintained for 100 hours to obtain polycrystalline powder of compound SbBO2F2.

[0068] Example 6

[0069] Preparation of compounds:

[0070] According to the reaction formula: Sb₂O₃ + 4SbF₃ + 6H₃BO₃ → 6SbBO₂F₂ + 9H₂O, compound SbBO₂F₂ was synthesized using the vacuum tube sealing method.

[0071] Weigh out 1g of a mixture of Sb₂O₃, SbF₃, and H₃BO₃ in a molar ratio of 1:4:6, and place it into a Φ40mm quartz tube. Evacuate the quartz tube to a vacuum level of 1×10⁻⁶. -3 After being sealed at high temperature, the mixture was placed in a muffle furnace and heated to 210°C at a rate of 5°C / h. The temperature was then maintained for 48 hours to obtain polycrystalline powder of compound SbBO2F2.

[0072] Example 7

[0073] Flux method for growing multifunctional SbBO2F2 crystals:

[0074] The polycrystalline SbBO2F2 powder prepared according to Example 1 was mixed evenly with flux B2O3 at a molar ratio of 1:1, and then packed into a Φ40mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. -3 Pa, after being sealed at high temperature, was placed in a muffle furnace, heated to 270°C, and kept at that temperature for 72 hours to obtain a mixed melt;

[0075] The resulting mixed melt was placed in a single crystal furnace and slowly cooled to 200°C at a rate of 0.1°C / h, and then rapidly cooled to room temperature at a rate of 5°C / h to obtain SbBO2F2 crystals with dimensions of 3.2 mm × 1.0 mm × 1.2 mm.

[0076] Example 8

[0077] Flux method for growing multifunctional SbBO2F2 crystals:

[0078] The polycrystalline SbBO2F2 powder prepared according to Example 2 was mixed with flux H3BO3 at a molar ratio of 1:0.2 until homogeneous, and then packed into a Φ40mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. -3 Pa, after being sealed at high temperature, was placed in a muffle furnace, heated to 250°C, and kept at that temperature for 56 hours to obtain a mixed melt;

[0079] The resulting mixed melt was placed in a single crystal furnace and slowly cooled to 200°C at a rate of 1°C / h, and then rapidly cooled to room temperature at a rate of 8°C / h to obtain a multifunctional SbBO2F2 crystal with dimensions of 2.0 mm × 1.5 mm × 1.2 mm.

[0080] Example 9

[0081] Flux method for growing multifunctional SbBO2F2 crystals:

[0082] The polycrystalline SbBO2F2 powder prepared according to Example 3 was mixed with flux B2O3 at a molar ratio of 1:0.5 until homogeneous. The mixture was then placed into a 40mm quartz tube, and the tube was evacuated to a vacuum level of 1×10⁻⁶. -3 Pa, after being sealed at high temperature, was placed in a muffle furnace, heated to 240℃, and kept at that temperature for 120 hours to obtain a mixed melt;

[0083] The resulting mixed melt was placed in a single crystal furnace and slowly cooled to 200°C at a rate of 1.5°C / h, and then rapidly cooled to room temperature at a rate of 10°C / h to obtain a multifunctional SbBO2F2 crystal with dimensions of 2.5mm×1.4mm×1.1mm.

[0084] Example 10

[0085] Flux method for growing multifunctional SbBO2F2 crystals:

[0086] The polycrystalline SbBO2F2 powder prepared according to Example 4 was mixed with flux HBO2 at a molar ratio of 1:0.1 until homogeneous, and then placed into a Φ40mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. -3 Pa, after being sealed at high temperature, was placed in a muffle furnace, heated to 250°C, and held at that temperature for 100 hours to obtain a mixed melt;

[0087] The resulting mixed melt was placed in a single crystal furnace and slowly cooled to 200°C at a rate of 2°C / h, and then rapidly cooled to room temperature at a rate of 8°C / h to obtain a multifunctional SbBO2F2 crystal with dimensions of 3.1 mm × 1.6 mm × 1.0 mm.

[0088] Example 11

[0089] Hydrothermal growth of antimony fluoroborate multifunctional crystals:

[0090] The polycrystalline powder of compound SbBO2F2 prepared according to Example 5 was dissolved in deionized water. The incompletely dissolved mixture was ultrasonically treated at 60°C to ensure thorough mixing and dissolution. The pH value was adjusted to 3 using HF.

[0091] The resulting mixed solution was transferred into the liner of a clean, uncontaminated 100 mL high-pressure reactor, and the reactor was then tightly sealed.

[0092] The high-pressure reactor was placed in a constant temperature chamber, heated to 180℃, and held at that temperature for 8 days. Then, it was cooled to room temperature at a rate of 5℃ / day, resulting in a multifunctional SbBO2F2 crystal with dimensions of 4.5mm×2.1mm×1.2mm.

[0093] Example 12

[0094] Hydrothermal growth of antimony fluoroborate multifunctional crystals:

[0095] The polycrystalline powder of compound SbBO2F2 prepared according to Example 6 was dissolved in deionized water. The incompletely dissolved mixture was ultrasonically treated at 60°C to ensure thorough mixing and dissolution. The pH value was adjusted to 6 using HBF4.

[0096] The resulting mixed solution was transferred into the liner of a clean, uncontaminated 100 mL high-pressure reactor, and the reactor was then tightly sealed.

[0097] The high-pressure reactor was placed in a constant temperature chamber, heated to 200℃, and held at that temperature for 6 days. Then, it was cooled to room temperature at a rate of 20℃ / day to obtain a multifunctional SbBO2F2 crystal with dimensions of 3.8mm×2.4mm×1.4mm.

[0098] Example 13

[0099] Any one of the SbBO2F2 crystals from Examples 7-12 can be cut into two identical prisms as a birefringent crystal, with the structure as follows: Figure 3As shown; the incident light direction is perpendicular to the crystallographic axis of the crystal, and the incident plane includes the other two crystallographic axes; the inclined surfaces of the two prisms are bonded together by an air layer or optical adhesive with different refractive indices to form polarizing prisms with different apex angles. Adjusting the apex angle parameter can cover the transmission wavelength range of the crystal; when the light is incident perpendicularly, the two orthogonally polarized beams are not deflected in the first prism, and the incident angle on the inclined surface is equal to the apex angle; by optimizing the apex angle design, one beam of polarized light can be totally internally reflected on the inclined surface, and the other beam can penetrate the connecting layer and exit from the second prism.

[0100] Example 14

[0101] A Wollaston prism was made using any one of the SbBO2F2 crystals from Examples 7-12. Figure 4 In a crystal prism, the two prisms have the same apex angle, but their crystallographic axes differ by 90° at the incident and exit planes. Perpendicularly incident light forms two orthogonally polarized beams that propagate in the same direction but at different speeds within the first prism. Upon entering the second prism, they separate due to birefringence caused by the change in refractive index, and then separate again upon exiting into the air. The higher the birefringence of the crystal, the more significant the beam-splitting effect.

[0102] Example 15

[0103] Any of the SbBO2F2 crystals from Examples 7-12 can be used to fabricate a wedge-shaped polarization beam splitter. Figure 5 The optical axes of the crystal are arranged in the direction shown in the figure. When natural light is incident, it is split into two linearly polarized beams. The distance between them increases with the increase of birefringence, making it easier to achieve optical path separation.

[0104] Example 16

[0105] Using any one of the SbBO2F2 crystals from Examples 7-12 as an optical isolator, a Faraday rotator (with its polarization plane rotated 45°) is inserted between two sets of birefringent deflectors placed at 45° angles to form a unidirectional light transmission system. Figure 6 a) Forward light can pass through, while reverse light is blocked. Figure 6 b).

[0106] Example 17

[0107] A beam shifter is fabricated using any of the SbBO2F2 crystals from Examples 7-12, with the optical axis of the crystal at a specific angle to the edge. Figure 7 a) When natural light is incident perpendicularly, it separates into o-rays and e-rays with their vibration directions perpendicular to each other. Figure 7 b) The higher the birefringence of the crystal, the greater the distance between the two beams, and the better the separation effect.

[0108] Example 18

[0109] Any one of the SbBO2F2 crystals from Examples 7-12 was added to a ball mill jar along with 50g of zirconia beads and ball milled at 300rpm for 1h to prepare a solid electrolyte SbBO2F2 material, and its ionic conductivity was tested.

[0110] The prepared sulfide solid electrolyte SbBO2F2 was placed in a glove box with a water content of less than 0.1 ppm and unidirectionally pressurized at 220 MPa to form an electrolyte sheet with a diameter of 10 mm and a thickness of 0.41 mm. Flexible stainless steel sheets were placed at both ends of the electrolyte sheet, and bidirectional pressure of 60 MPa was applied to assemble a blocked electrode battery. The prepared blocked electrode battery was subjected to AC impedance testing. Figure 8 );

[0111] The prepared sulfide solid electrolyte SbBO2F2 was placed in a glove box with a water content of less than 0.1 ppm and unidirectionally pressurized at 220 MPa to form an electrolyte sheet with a diameter of 10 mm and a thickness of 1.19 mm. Flexible stainless steel sheets were placed at both ends of the electrolyte sheet, and bidirectional pressure of 60 MPa was applied to assemble a blocked electrode battery. The prepared blocked electrode battery was subjected to AC impedance testing. Figure 8 );

[0112] The prepared sulfide solid electrolyte SbBO2F2 was placed in a glove box with a water content of less than 0.1 ppm and unidirectionally pressurized at 220 MPa to form an electrolyte sheet with a diameter of 10 mm and a thickness of 3.60 mm. Flexible stainless steel sheets were placed at both ends of the electrolyte sheet, and bidirectional pressure of 60 MPa was applied to assemble a blocked electrode battery. The prepared blocked electrode battery was subjected to AC impedance testing. Figure 8 ).

[0113] Example 19

[0114] The thermodynamic behavior of any one of the SbBO2F2 crystals from Examples 7-12 was tested in the range of 100–380 K; the results are as follows: Figure 9 As shown, positive thermal expansion is displayed along the X1 axis, negative thermal expansion along the X2 axis, and positive thermal expansion along the X3 axis, with coefficients α and α, respectively. X1 =26.40×10 -6 / K、α X2 = -3.85 × 10 -6 / K、α X3 =24.66×10 -6 / K, and α V =47.45×10 -6 / K, exhibiting a negative thermal expansion effect.

[0115] Example 20

[0116] Any one of the SbBO2F2 crystals in Examples 7-12 was washed and dried in ethanol, and then vacuum dried overnight at room temperature to obtain the photocatalytic SbBO2F2 material.

[0117] The material was washed and dried in ethanol, and then vacuum dried overnight at 50°C to obtain the photocatalytic SbBO2F2 material.

[0118] The material was washed and dried in ethanol, and then vacuum dried overnight at 75°C to obtain the photocatalytic SbBO2F2 material.

[0119] The obtained photocatalytic SbBO2F2 material, when excited in the ultraviolet light band, exhibits good photocatalytic activity and is an ideal light-absorbing material.

Claims

1. A scheelite-like compound, antimony fluoroborate, characterized in that... The compound has the chemical formula SbBO2F2 and a molecular weight of 202.

56. It was prepared by vacuum sealing method.

2. A method for preparing the compound antimony fluoroborate as described in claim 1, characterized in that... The tubes were prepared using a vacuum sealing method, and the specific procedures are as follows: The vacuum sealing method was used to prepare the compound antimony fluoroborate. Mix Sb-containing compounds and B-containing compounds with a purity ≥ 99% thoroughly at a molar ratio of Sb:B = 1:1, and pack the mixture into a quartz tube. Evacuate the quartz tube to a vacuum level of 1 × 10⁻⁶. −3 After being sealed at high temperature, the sample is placed in a muffle furnace and heated to 200-250 °C at a rate of 5-10 °C / h, and held at that temperature for 24-120 hours to obtain a polycrystalline powder sample of compound SbBO2F2. The Sb-containing compounds are SbF3, Sb2O3, and SbOF; the B-containing compounds are H3BO3, B2O3, and HBO2.

3. A multifunctional crystal of antimony fluoroborate, characterized in that... The crystal has the chemical formula SbBO2F2, a molecular weight of 202.56, belongs to the monoclinic crystal system, and has a space group of [space group number missing]. C 2 / c The cell parameters are a = 6.3036(5) Å, b = 12.2182(10) Å, and c = 4.5611(4) Å. α = γ = 90°, β = 122.261(3) °, unit cell volume is 297.06(4) Å 3 .

4. A method for preparing the antimony fluoroborate multifunctional crystal as described in claim 3, characterized in that... Crystals are grown using either fluxing or hydrothermal methods: The flux method for growing antimony fluoroborate multifunctional crystals is carried out according to the following steps: a. Mix Sb-containing compounds and B-containing compounds with a purity ≥ 99% uniformly at a molar ratio of Sb:B = 1:1, pack the mixture into a quartz tube, seal it at high temperature, and place it in a muffle furnace. Heat the mixture to 200-250℃ and hold it at that temperature for 24-120 hours to obtain polycrystalline powder of compound SbBO2F2. The Sb-containing compounds are SbF3 and Sb2O3; the B-containing compounds are H3BO3, B2O3, and HBO2. b. Mix the polycrystalline SbBO2F2 obtained in step a with a flux at a molar ratio of 1:0.1-1 until homogeneous, pack the mixture into a quartz tube, seal it at high temperature, place it in a muffle furnace, heat it to 220-270℃, hold it at that temperature for 72-120 hours, then cool it down to 180℃ at a rate of 0.1-3℃ / h, and then rapidly cool it down to room temperature at a rate of 5-10℃ / h to obtain SbBO2F2 multifunctional crystals. The flux is H3BO3 or HBO2. The hydrothermal growth of antimony fluoroborate multifunctional crystals is carried out according to the following steps: a. Mix Sb-containing compounds and B-containing compounds with a purity ≥ 99% uniformly at a molar ratio of Sb:B = 1:1, pack the mixture into a quartz tube, seal it at high temperature, and place it in a muffle furnace. Heat the mixture to 200-250℃ and hold it at that temperature for 24-120 hours to obtain polycrystalline powder of compound SbBO2F2. The Sb-containing compounds are SbF3 and Sb2O3; the B-containing compounds are H3BO3, B2O3, and HBO2. b. Dissolve the polycrystalline SbBO2F2 compound obtained in step a in ethanol. Treat the incompletely dissolved mixture with ultrasound at 60°C to ensure it is fully mixed and dissolved. Then adjust the pH value to 3-6 with HF or HBF4. c. Transfer the mixed solution obtained in step b into the liner of a clean, uncontaminated 100 mL high-pressure reactor, and tighten and seal the reactor. d. Place the high-pressure reactor in a constant temperature chamber, heat it to 180-220℃, keep it at that temperature for 5-8 days, and then cool it down to room temperature at a rate of 5-20℃ / day to obtain SbBO2F2 multifunctional crystals.

5. The use of the antimony fluoroborate multifunctional crystal as described in claim 3 in the preparation of polarizing beam splitters or optical elements in multiple bands of infrared-visible-ultraviolet.

6. The use according to claim 5, characterized in that... The optical elements mentioned are polarization beam splitters, optical isolators, circulators, beam shifters, optical polarizers, optical analyzers, optical polarizers, optical modulators, polarization beam splitters, phase delay devices, or electro-optic modulators.

7. The use of the antimony fluoroborate multifunctional crystal as described in claim 3 in the preparation of electrolyte materials for solid-state batteries, sensors, and microdevices, wherein the crystal has a conductivity of 1.53 × 10⁻⁶ at room temperature. -6 S·m -1 .

8. The use of the antimony fluoroborate multifunctional crystal as described in claim 3 in the preparation of thermal expansion materials for thermal components in low-temperature infrared detection and electronic packaging, wherein the coefficients of thermal expansion of the thermal expansion material along the X1, X2, and X3 directions are 26.4044 × 10⁻⁶. -6 K -1 -3.8245×10 -6 K -1 , 24.6589×10 -6 K -1 Furthermore, it exhibits negative thermal expansion in the X2 direction.

9. The use of the antimony fluoroborate multifunctional crystal as described in claim 3 in the preparation of photocatalytic elements for environmental purification and pollution control, energy conversion and storage, and industrial and chemical synthesis.

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