17 results about "Trigonal crystal system" patented technology

The application discloses a chromium-doped yttrium oxide crystal material and a structural design method thereof, and belongs to the technical field of inorganic photoelectric functional crystal materials. + The crystal is of R3 trigonal crystal system minimum energy structure, Cr 9‑ The molar doping percentage is 3.125%, occupies a 1b Wyckoff site in a crystal lattice gap, forms [CrO6] 9‑ Regular octahedral coordination, Cr-O bond length is 2.073 angstrom; lattice constants a=b=10.4957 angstrom, c=18.1750 angstrom, a Γ point direct band gap is 3.23 eV, there is no virtual frequency in a phonon spectrum, dynamics is stable, simulated XRD is matched with an experimental spectrum, and Cr-O and Y-O bonds are all ionic bonds. The application realizes accurate determination of a ground state structure, stability verification and electronic property analysis by adopting CALYPSO structure prediction combined with first principle calculation, provides a standardized theoretical design process, and can be used for efficient development of photoelectric functional materials such as solid-state lasers, white light LEDs, solar cells and the like.

The present invention relates to a preparation method for a trigonal nonlinear optical crystal frequency converter and an operating method. The frequency converter has a first group of parallel surfaces and a second group of parallel surfaces, wherein the first group of parallel surfaces is parallel to a c-axis and an a-axis of an optical crystal, an angle α is formed between a normal of the second group of parallel surfaces and the c-axis, and an included angle β is formed between the projection of the normal on an a-b plane and the a-axis; and θPM having a relation shown in Formula (1) and Formula (2) is a phase matching angle of the nonlinear optical crystal satisfying an incident fundamental frequency light and an emergent variable frequency light, where θB=arctann, which is a Brewster angle, n is the refractive index of the nonlinear optical crystal corresponding to the incident fundamental frequency light, and the second group of parallel surfaces includes a light transmission input surface and a light transmission output surface of the frequency converter. The present invention provides, on the basis of a thin sheet-like primary crystal, a preparation method for a nonlinear optical crystal frequency converter having a length in a light transmission direction as large as possible and suitable for continuous wave application and an operating method.

The invention belongs to the technical field of crystal materials and optics, and relates to a potassium borate niobate electro-optical crystal and a preparation method and application thereof.The chemical formula of the potassium borate niobate electro-optical crystal is K3Nb3B2O12, the crystal belongs to a trigonal system, the space group is P31m, and the cell parameters are as follows: alpha = beta = 90 degrees, gamma = 120 degrees, Z = 1, Z = 1, Z = 1, Z = 1, and Z = 1. The potassium boron niobate electro-optical crystal has the characteristics of wide transmission range, high transmittance, large electro-optical coefficient and the like, has stable physical and chemical properties and thermal properties, is not easy to deliquesce, has good mechanical properties and is easy to process.

The invention relates to the technical field of photochromic coordination polymers, in particular to a naphthalimide-based photochromic coordination polymer and a preparation method thereof. The chemical formula of the naphthalimidogen photochromic coordination polymer is [Sr (AlaNDI) (18-C-6)] n, AlaNDI is deprotonated (2S, 2 'S)-2, 2'-(1, 3, 6, 8-tetraoxo-1, 3, 6, 8-tetrahydrobenzo [1mn] [3, 8] phenanthroline-2, 7-diyl)-dipropionic acid), and AlaNDI is deprotonated (2S, 2 'S)-2, 2'-(1, 3, 6, 8-tetraoxo-1, 3, 6, 8-tetrahydrobenzo [1mn] [3, 8] phenanthroline-2, 7-diyl)-dipropionic acid. The 18-C < 6 > is 18-crown-6; the naphthalimide-based photochromic coordination polymer is a trigonal system, the space group is P3212, under the irradiation of a xenon lamp, the color of the coordination polymer is quickly changed into dark brown from light yellow within 30 seconds, a wide absorption band extending to a near-infrared region appears, and an obvious photochromic behavior is shown.

The invention belongs to the technical field of inorganic materials, and particularly relates to a ternary layered lanthanide MAX phase material with a chalcogen element at the A site as well as a preparation method and application of the ternary layered lanthanide MAX phase material. The molecular formula of the ternary layered lanthanide MAX phase material with the A site as the chalcogen element is M2AX, M is any one or more of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, A is any one or more of S, Se and Te, and X is any one or more of B, C, N, P, S, Se and Te; the material has a trigonal system structure, the space group is R-3m, and the thermal conductivity at the temperature of 300K is less than or equal to 15W / (mK). The combination of chalcogenide and lanthanide greatly changes the electronic structure of the MAX phase material, and the prepared material has low thermal conductivity.

The invention discloses a lithium molybdenum chromate single crystal, a preparation method thereof and an optical filter, and belongs to the technical field of optical materials. The general chemical formula of the lithium molybdenum chromate single crystal is Li2CrxMo1-xO4, x is larger than or equal to 0.005 and smaller than or equal to 0.5, the lithium molybdenum chromate single crystal is a trigonal system, the space group is R, the lithium molybdenum chromate single crystal is in cut-off absorption at the wavelength of 500 nm or below, the lithium molybdenum chromate single crystal has high transmittance from 500 nm or above to the infrared band, the room-temperature heat conductivity is 4 W * m <-1 > * K <-1 >, and the lithium molybdenum chromate single crystal is suitable for manufacturing 500 nm long-wave-pass optical filters high in stability and reliability. According to the invention, a proper amount of hexavalent chromium (Cr < 6 + >) is introduced into a lithium molybdate matrix, and an absorption edge can be moved and a required long-wave-pass characteristic can be formed by regulating and controlling the content of hexavalent chromium; meanwhile, the oxide crystal is more suitable for high-power transmission and optical application in a harsh environment due to high thermal conductivity and mechanical stability, and the problem that an existing thin film and a polymer optical filter are insufficient in thermal stability and high-power bearing is solved.

The invention relates to a novel potassium lutetium borate (K7.5 Lu2. 5B15O30) second-order nonlinear optical crystal, which has a short ultraviolet cut-off edge and a remarkable frequency doubling effect and is suitable for expanding the wavelength of a laser source to a wider spectral region. The crystal is prepared by adopting a high-temperature solid phase method and a high-temperature solution method, belongs to a trigonal system and an R32 (No.155) space group, has accurate measurement of unit cell parameters, and shows excellent nonlinear optical characteristics and a wide light transmission range. The ultraviolet cut-off edge of the K7.5 Lu2.5 B15O30 crystal is shorter than 200nm, the experimental band gap is 6.3 eV, and the K7.5 Lu2.5 B15O30 crystal is suitable for high-precision optical equipment and a precision measurement technology. The invention also provides application of the crystal in nonlinear optical devices, such as a laser frequency multiplier, which can generate laser output different from incident light frequency, and provides new material selection and technical support for development of laser technology.

The invention discloses a broadband near-infrared stress luminescent material without pre-irradiation as well as a preparation method and application of the broadband near-infrared stress luminescent material. The material is La < 3 > Ga < 5-5x > GeO < 14: 5x > Cr < 3 + >, wherein x is greater than or equal to 0.0025 and less than or equal to 0.02; the crystal structure belongs to a P321 trigonal system structure, and the active ion is Cr < 3 + >. The preparation method comprises the following steps: respectively weighing a lanthanum-containing compound raw material, a gallium-containing compound raw material, a germanium-containing compound raw material and a chromium-containing compound raw material, uniformly grinding the raw materials, grinding, pre-sintering, calcining, cooling to room temperature along with a furnace, and grinding to obtain the near-infrared stress luminescent material without pre-irradiation. The material disclosed by the invention shows broadband emission in a near-infrared 1 region range, and has good self-energy-supply performance, the stress luminescence intensity can be self-recovered, and the stress luminescence intensity can be kept at a considerable level even if force circulation times are continuously applied for multiple times. The material can be used for preparing a stress luminescent film suitable for biological physiological parameter detection.

The present application relates to the field of refractory material, and particularly to a kind of anti-vanadium erosion refractory material, the chemical general formula of the refractory material is: (Mg a Ca b Sr c Ba 1‑a‑b‑c ) x (V d Nb e Ta f Mn 1‑d‑e‑f )2O x+5 , its crystal structure belongs to trigonal system;With adjustable component ratio, wherein 2≤x≤3, 0≤a≤0.1, 0.8≤b≤1, 0≤c≤0.1, 0.9≤d≤1, 0≤e≤0.05, 0≤f≤0.05.The present application can effectively improve the anti-vanadium erosion performance of the material by introducing vanadium-containing compounds into the refractory material, the component ratio of the refractory material and the replaceability of the precursor make it have better adaptability and flexibility to meet the requirements of different industrial equipment.

Provided in the present invention are a porous metal-cyanide-based framework material (MCF) having a cation-gated effect, a preparation method therefor, and the use thereof in carbon-dioxide capture. The framework material has a general structural formula of Mx[M'(CN)6]y•Az•nH2O, wherein n represents the water content of the material, and 0≤n≤10; when n≥1, the XRD pattern of the crystal structure has a single peak at 2θ=16±2° and 20±2°, respectively, and has a single peak or a double peak at 2θ=13±2°, 22±2° and 24±2°, respectively, the crystal structure belonging to the space group of formula (I) in a trigonal crystal system (space group number 167); and when 0≤n<1, the XRD pattern of the crystal structure has a single peak at 2θ=10±2° and 16.5±2°, respectively, and has a single peak or a double peak at 2θ=14.5±2° and 20.2±2°, respectively, the space group of the crystal structure changing into a P2 / c space group (space group number 13). The framework material has a cage-like structure, and each cage has six hexagonal pore windows and six quadrilateral pore windows. The monovalent cations at the hexagonal pore windows exhibit a gating effect and can selectively allow carbon dioxide molecules to pass through. The framework material has the highest CO2 adsorption capacity and selectivity in carbon dioxide capture, especially in carbon dioxide adsorption applications under low-pressure (≤0.15 bar) and high-humidity (≥40% RH) environments.

The invention relates to a phosphorus-silicon-indium-barium infrared nonlinear optical crystal material as well as a preparation method and application thereof. The chemical formula of the crystal is BaIn2Si7P12, the molecular weight is 746.92, the crystal is crystallized in a trigonal system, the space group is R3, and the cell parameters are as follows: a = b = 13.2045 (6), and c = 8.9694 (7). Gamma is equal to 120 degrees, and V is equal to 1354.37 (16) 3. Phosphorus-silicon-indium-barium is a black crystal with a non-centrosymmetric structure, and takes [SiP4], [Si2 / 3In1 / 3P4] tetrahedrons and [BaP12] polyhedrons as basic structural elements. Phosphorus silicon indium barium synthesized in a closed vacuum quartz ampoule by adopting a high-temperature solid-phase synthesis method has excellent infrared nonlinear optical performance, the laser damage threshold is 8 times of that of AgGaS2 (AGS), the frequency-doubled effect is 1.1 times of that of a commercial material ZnGeP2 (ZGP), and the phosphorus silicon indium barium has important application value in a medium-wave infrared laser system.

The application discloses a new actinium structure material obtained through first principle calculation and prediction, and belongs to the technical field of nuclear medical radiotherapy. The structure has an international symbol of Rm, a space group of 166, belongs to a trigonal system, a lattice constant of a=b=c=9.98371 Å, and a cell angle of α=β=γ=23.3174°. Ac1 is located at (0, 0, 0) in the cell, Ac2 is located at (0.77754, 0.77754, 0.77754), and Ac3 is located at (0.22246, 0.22246, 0.22246), thereby forming a layered hexagonal stacking structure. The structure has a low energy under normal pressure and is more stable than a traditional Fmm structure considered to be stable. Based on density functional theory calculation, the structure material has metallic properties, can be used for targeted alpha therapy, causes malignant cell death through alpha particle release, and has potential application value in the field of nuclear medical imaging and radiotherapy.

A lithium ion conductor including a first compound represented by Formula 1.In Formula 1, M1 includes one or more elements belonging to groups 3 to 15 of the periodic table, and 1≤x≤3, 0.2<y<1, 0.5≤z≤1.5, 3.5≤w≤4.5 and 4.5≤z+w≤5.5. The first compound includes a crystalline phase belonging to the P-3m1 space group of a trigonal crystal system. A lithium battery including the lithium ion conductor, and a method of preparing the lithium ion conductor.

The invention belongs to the technical field of metal-organic framework materials, and provides a metal cyanide metal-organic framework material with a cation gating effect and a preparation method and carbon dioxide capture application thereof, the structural general formula of the metal-organic framework material is Mx [M '(CN) 6] y.Az.nH2O, n represents the water content of the material, and n is larger than or equal to 0 and smaller than or equal to 10; when n is greater than or equal to 1, the XRD spectrum of the crystal structure has a single peak at 2theta = 16 + / -2 degrees and 20 + / -2 degrees, and has a single peak or double peaks at 2theta = 13 + / -2 degrees, 22 + / -2 degrees and 24 + / -2 degrees, and the crystal structure belongs to a space group (space group number 167) in a trigonal system; when 0 < = nlt; 1, the XRD pattern of the crystal structure has a single peak at 2 [theta] = 10 + / -2 degrees and 16.5 + / -2 degrees, and has a single peak or double peaks at 14.5 + / -2 degrees and 20.2 + / -2 degrees, and the space group of the crystal structure is converted into a P2 / c space group (space group number 13). The metal-organic framework material has the highest CO2 adsorption capacity and selectivity in carbon dioxide capture, in particular to flue gas carbon dioxide adsorption in a low-pressure (less than or equal to 0.15 bar) and high-humidity environment (more than or equal to 40% RH).

This invention discloses a method for preparing trigonal selenium thin films and a solar cell thereof. The invention utilizes thermal evaporation or sublimation to deposit trigonal selenium thin films at a substrate growth temperature higher than the phase transition temperature between the solid and gas phases of selenium, i.e., under conditions of secondary sublimation. During the preparation process, the substrate growth temperature is 190℃–210℃, the selenium source temperature is 210–240℃, and the selenium thin film growth time is 10s–10min. This invention is the first to propose a method for directly preparing high-quality trigonal selenium based on a high-temperature secondary sublimation process, eliminating the need for a secondary recrystallization process. By controlling the growth temperature, growth time, and growth atmosphere, the nucleation growth, grain growth, and lattice orientation of the selenium thin film can be controlled, resulting in a high-quality trigonal selenium thin film with a single phase, controllable lattice orientation, and dense grain arrangement, thereby improving the performance of selenium-based solar cell devices.

The invention relates to a multifunctional rare earth borate material, a preparation method, a single crystal growth method and application, and belongs to the technical field of rare earth borate functional materials. The chemical formula of the material is K5Mg3Pr3 (BO3) 6, the material is crystallized in a trigonal system, the space group is P31c, and the cell parameters are as follows: a = b = 9.0140 (2), c = 13.0557 (5), alpha = beta = 90 degrees, and gamma = 120 degrees. Pr ions in the K5Mg3Pr3 (BO3) 6 compound are bridged through O ions on a BO3 group to form a two-dimensional triangular lattice, the ultraviolet absorption cutoff wavelength is 255 nm, the band gap is 4.87 eV, and it is indicated that the compound is an ultraviolet band nonlinear optical material. The material ingeniously combines the characteristics of magnetic rare earth ions Pr and BO3 elements, so that the material has optical response and two-dimensional spin blocking quantum magnetism at the same time.

The application discloses a lithium molybdate-chromate monocrystal, a preparation method thereof and an optical filter, and belongs to the technical field of optical materials. x Mo 1‑x O4, wherein 0.005<=x<=0.5, the lithium molybdate-chromate monocrystal is of a trigonal system, a space group is R, is of a cut-off absorption below a wavelength of 500 nm, has a high transmittance from above 500 nm to an infrared wave band, and has a room-temperature thermal conductivity of 4 W.m ‑1 ·K ‑1 -1.K-1, and is suitable for manufacturing a 500 nm long-wave-pass optical filter with high stability and high reliability. The application introduces appropriate hexavalent chromium (Cr 6+ ) into a lithium molybdate matrix, and can move an absorption edge and form a required long-wave-pass characteristic by adjusting the content of hexavalent chromium; meanwhile, the high thermal conductivity and mechanical stability of the oxide crystal make it more suitable for high-power transmission and optical application in a harsh environment, and solve the problems of the existing thin film and polymer optical filter in thermal stability and high-power bearing.