34 results about "Tetragonal crystal system" patented technology

The invention discloses tetragonal system germanium dioxide and a hydrothermal synthesis method thereof. According to the method, hexagonal crystal system germanium dioxide is taken as a raw material, a hydrothermal reaction is carried out in an acidic aqueous solution, and efficient conversion from a hexagonal crystal system to a tetragonal crystal system is realized by controlling the reaction temperature to be 120-240 DEG C, the reaction time to be 24-48 hours and the pH value to be 1-3. According to the preferable scheme, the raw materials are subjected to calcination pretreatment at the temperature of 500-600 DEG C, the yield of the tetragonal crystal phase can be remarkably increased, and the synthesis temperature can be reduced to 120 DEG C. According to the invention, stable synthesis of tetragonal system germanium dioxide is realized for the first time under the mild condition of 240 DEG C and below, and the technical problem that high-temperature transformation at 1000 DEG C or above is needed in the traditional method is solved. The tetragonal crystal system germanium dioxide prepared by the method is of a regular polyhedral structure, has the particle size of 400-500nm, and can be used as a high-efficiency catalyst for polyester synthesis. The process is energy-saving and environment-friendly, the total utilization rate of the raw materials is increased by recycling the waste liquid, and the process has remarkable industrial application value.

Provided is a rare earth magnet alloy having a tetragonal R2Fe14B crystal structure, including: a main phase containing, as main constituent elements, at least one kind selected from the group consisting of: Nd; La; and Sm, Fe, and B; and a sub-phase containing, as main constituent elements, at least one kind selected from the group consisting of: Nd; La; and Sm, and O, wherein La substitutes for at least one of a Nd(f) site or a Nd(g) site, wherein Sm substitutes for at least one of a Nd(f) site or a Nd(g) site, wherein La segregates in the sub-phase, and wherein Sm is dispersed in the main phase and the sub-phase without segregation.

This invention relates to a method for preparing a nonlinear optical material and its application, specifically a magnesium aminodiacetate dihydrate compound. The molecular formula of the crystal is Mg[NH2(CH2COO)2]·2H2O. The Mg[NH2(CH2COO)2]·2H2O crystal does not have a center of symmetry, belongs to the tetragonal crystal system, has a space group of P-421c, and has cell parameters of α=β=γ=90°, Z=2. The nonlinear optical crystal of this invention has a large frequency doubling effect; at the same time, its ultraviolet absorption edge is 225nm, thus belonging to the tetragonal crystal system, with a space group of P-421c and cell parameters of α=β=γ=90°, Z=2. The nonlinear optical crystal can achieve the second harmonic of Nd:YAG (λ=1.064μm); and it can be predicted that the Mg[NH2(CH2COO)2]·2H2O crystal can be used in the third harmonic generator of Nd:YAG.

A method of preparing bismuth vanadate particles is described. The bismuth vanadate particles prepared via ultrasonication and hydrothermal treatment exhibit controlled morphology (e.g., octahedral shape) and crystallinity (e.g., tetragonal crystal symmetry). A photoelectrode containing bismuth vanadate particles and a method of using the photoelectrode in a photoelectrochemical cell for water splitting is also provided.

The invention belongs to the technical field of new materials, and particularly relates to a pyrazolyl framework material as well as a preparation method and application thereof. The ligand is 4, 4 '-(2, 2'-bis (trifluoromethyl)-[1, 1 '-biphenyl]-4, 4'-diyl)-bis (1H-pyrazole), the crystal structure of the ligand belongs to a P21 / c space group of a monoclinic system, and the cell parameters of the ligand are as follows: the axial length a is 9.0797 (2), the b is 19.7923 (4), the c is 90.0 (10), the axial angle alpha is equal to gamma and is 90 degrees, the beta is equal to 92.196 (2) degrees, the cell volume is 5695.9 (2) 3, and the Z is 12. Two zinc-based complexes are synthesized based on the ligand and the same series of ligands 4, 4 '-(2, 2'-dimethyl-[1, 1 '-biphenyl]-4, 4'-diyl)-di (1H-pyrazole), the structure of the zinc-based complexes 1 belongs to a tetragonal system and an I41 / a space group, and the cell parameters of the zinc-based complexes 1 are that the axial length a = b = 34.8953 (6), the c = 13.4293 (6), the axial angle alpha = beta = gamma = 90 degrees, the cell volume is 16352.6 (7) 3, and Z = 228. The series of zinc-based complexes can be applied to the field of butane isomer gas separation.

To provide a zirconia-based composite oxide powder with small particle size, small pore volume, and porous properties. [Solution] The material contains zirconia and an oxide of a rare earth element, with a zirconia content of 50% to 95% by weight, and the pore distribution calculated from the scattering curve measured by small-angle X-ray scattering has a monomodal distribution in the range of 1 nm to 15 nm, and the particle size D in the particle size distribution measured by laser diffraction-scattering is 50 The particle size is between 0.05 μm and less than 1.0 μm, and the tap density is 1.0 g / cm³. 3 More than 1.7g / cm 3 The following is a zirconia-based composite oxide powder whose crystal system, as identified by powder X-ray diffraction, is either tetragonal, cubic, or both.

The present application relates to a kind of aluminum-based metal-organic framework material, preparation method, adsorption separation device and the method for separating hydrocarbon mixture.The chemical formula of the aluminum-based metal-organic framework material is C 54 H 33 Al3O 21 It is a kind of super-microporous metal-organic framework material, belongs to tetragonal system.This material shows significant advantages in the selective separation and purification of C6 isomers, and is the first metal-organic framework material that can separate single-branched and double-branched C6 at normal temperature and pressure with high efficiency so far.

The invention discloses a magnetic Weel semimetal single crystal with novel quantum oscillation as well as a preparation method and application of the magnetic Weel semimetal single crystal. The single crystal is prepared by adopting a self-dissolution method, the chemical formula of the single crystal is PrAlSi, the single crystal structure belongs to a LaPtSi-type tetragonal crystal system, the space group is non-centrosymmetric I41md (No.109), a magnetic test shows the ferromagnetic ground state characteristic of the PrAlSi single crystal, and the ferromagnetic ground state characteristic and the ferromagnetic ground state characteristic indicate that the PrAlSi single crystal is a novel magnetic Weil semi-metal material of which the space inversion symmetry and the time inversion symmetry are broken at the same time. Therefore, the single crystal system has a stable foreign state. The PrAlSi single crystal shows obvious resistivity-temperature quantum oscillation, which is a novel quantum oscillation behavior and is derived from destructive interference between SdH oscillation of a spin splitting Fermi surface caused by strong exchange interaction of Weyl Fermi-4f electrons. The magnetic Weel semimetal single crystal with the stable Weel state and the novel quantum oscillation has a good application prospect in the aspects of spintronics devices and sensors.

The invention discloses a nanoparticle introduced with a second-phase coherent defect as well as a preparation method and application of the nanoparticle. The Nb14Mo3O44 phase and the Nb12MoO33 phase are included, and a coherent heterostructure is formed between the Nb14Mo3O44 phase and the Nb12MoO33 phase through an atomic-scale matched shear co-boundary interface. The nanoparticles are of a tetragonal system, the space group is C2 / m, and the particle size is 50-200 nm. The preparation method comprises the following steps: forming a precursor solution from a niobium source, a molybdenum source and a ligand in N, N-dimethylformamide or ethanol, carrying out a hydrothermal reaction, and sintering in a protective atmosphere. The nano-particle is used as a lithium ion battery negative electrode material, solves the contradiction that the fast charging performance and the capacity of the traditional niobium-based oxide cannot be obtained at the same time, is suitable for electric automobiles and high-power energy storage equipment, is green and controllable in preparation process, and has a large-scale industrialization prospect.

A sulfur oxide adsorption component contains manganese oxide, the crystal structure of the manganese oxide being tetragonal and / or hexagonal.

This invention discloses a thermochromic luminescent material, its preparation method, and its applications. The general chemical formula of the thermochromic luminescent material is RbCd. (1‑x) Mn x Cl3; x is the mole fraction, with a value ranging from 0 < x ≤ 15%. The thermochromic luminescent material provided by this invention exhibits significant thermochromic luminescence characteristics. At room temperature, RbCd... (1‑x) Mn x Cl3 belongs to the orthorhombic crystal system with space group Pnma. Under ultraviolet light irradiation, it exhibits red light emission. When RbCd... (1‑x) Mn x When Cl3 is heated to above 420K, its crystal structure changes to a tetragonal system with a space group of P4 / mbm, exhibiting yellow light emission. Furthermore, the fluorescence intensity of this thermochromic luminescent material increases with increasing temperature during the temperature variation process from 160K to 420K, demonstrating a significant resistance to thermal quenching. In addition, this invention provides a simple synthesis process with mild reaction conditions, abundant and inexpensive raw materials, solving the problems of lead toxicity and instability in lead-based halide crystals, and is expected to be widely used in intelligent responsive luminescence, anti-counterfeiting, and temperature measurement fields.

The application relates to a thulium-terbium co-doped calcium yttrium aluminate near-infrared waveband laser crystal and a preparation method and application thereof. x Tb y CaY 1‑x‑y AlO4, wherein the value range of x is 0.001-0.05, the value range of y is 0.0001-0.002, the space group is I4 / mmm, and the crystal is tetragonal. Compared with the prior art, the laser crystal can efficiently realize near-infrared waveband laser output near 1.5 microns and can be applied to the fields of medical treatment, military affairs, communication detection and the like.

The invention discloses a vanadate compound, a vanadate nonlinear optical crystal and a preparation method and application of the vanadate nonlinear optical crystal. The chemical formula of the vanadate nonlinear optical crystal is K4Zn (VO3) 5Br, the vanadate nonlinear optical crystal is of a non-centrosymmetric structure and belongs to a tetragonal crystal system, the space group is P4, and the unit cell parameters are alpha = 90 degrees, beta = 90 degrees, gamma = 90 degrees and Z = 1. The vanadate nonlinear optical crystal provided by the invention has a high damage threshold, a large nonlinear optical effect, a high electro-optic coefficient and a wide transmission range; meanwhile, the material has the advantages of being wide in light transmitting range, stable in physical and chemical performance, easy to cut, polish, process and store and the like, and is suitable for an infrared light area, so that the material has a good application prospect in the aspect of preparing a laser nonlinear optical composite functional device, an electro-optical crystal device or a laser.

The application provides a preparation method and application of high-nucleus cobalt cluster-based MOFs and derivatives thereof, including Co 16 -MOF-BDC-X, Co 16 -MOF-BPDC, crystallized in a tetragonal system, and a space group is P42 / nmc, wherein Co 16 The cell parameter of the MOF-BDC-X is: alpha=beta=gamma=90°, Co 16 The cell parameter of the MOF-BPDC is: alpha=beta=gamma=90°, the application adopts a strategy of assisted synthesis of double small molecules (azide molecules and formic acid molecules), and successfully constructs a series of novel high-nucleus cobalt cluster-based MOFs, including Co 16 -MOF-BDC, Co 16 -MOF-BDC-X (X=NH2, NO2, OH, Br) and Co 16 -MOF-BPDC, the application realizes a great improvement of solar energy conversion efficiency by regulating functional groups on the MOF ligand and modifying strong absorption photosensitive centers on the MOF metal node, and exhibits application in the field of photocatalysis.

The application relates to the field of antibacterial materials, in particular to a novel inorganic antibacterial agent (AgLaMo2O8) and a preparation method thereof. 24 The application uses silver nitrate, lanthanum nitrate and (NH4)6Mo7O 24 as raw materials, citric acid as a complexing agent, and ammonia water as a pH regulator, and through control of the citric acid dosage and self-ignition ignition temperature and time, AgLaMo2O8 superfine powder with different particle sizes is synthesized at low temperature in one step. The application provides a method for synthesizing AgLaMo2O8 superfine powder with a tetragonal crystal system at low temperature in one step, and the method is applied to the antibacterial field for the first time. The method has the advantages of short reaction time, simple process, convenient operation, high purity yield, low cost and easy scale production. The obtained AgLaMo2O8 superfine powder has better high-temperature stability and bacteriostatic performance, the high-temperature application advantage is more obvious, and the application field is more extensive.

The application provides a trimanganese tetraoxide catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts.The trimanganese tetraoxide catalyst comprises an active component and a modified additive, the active component is trimanganese tetraoxide, and the modified additive is a composite system of cobalt elements and boron elements;the doping amount of the cobalt elements is 0.1-1.1% of the mass of the trimanganese tetraoxide, and the doping amount of the boron elements is 0.01-0.1% of the mass of the trimanganese tetraoxide;the catalyst is a nanoscale particle with a particle size of 10-50 nm and a tetragonal crystal type.The cobalt-boron composite doping system is adopted, the cobalt controls the electronic structure and oxygen vacancy concentration of the trimanganese tetraoxide, the boron optimizes the surface acid sites and enhances the adsorption capacity of reactants, and the two play a synergistic catalytic role;by accurately controlling the doping amount and a specific process, the specific surface area and the exposure ratio of active sites of the catalyst are improved under the synergy of the nanoscale and the crystal type, and meanwhile, the crystal structure is kept complete, thus providing an excellent microstructure basis for the catalytic reaction.

A magnetic refrigeration material that includes a tetragonal Eu-Ti-O–based compound containing europium (Eu), titanium (Ti) and oxygen (O) as constituent elements.

Provided are a lithium bismuth oxyhalide-based lithium-ion conductor, a manufacturing method therefor, and a lithium battery comprising same. The lithium bismuth oxyhalide-based lithium-ion conductor has a tetragonal crystal system and, through the unique crystal structure, can exhibit excellent lithium-ion conductivity.

The present invention provides a sulfur oxide adsorbent component, a sulfur oxide adsorbent, a method for adsorbing and desorbing sulfur oxides, and an exhaust gas treatment system, all of which exhibit high sulfur oxide adsorption capabilities in relatively high-temperature environments. [Solution] The sulfur oxide adsorbent component contains manganese oxide, and the crystal structure of the manganese oxide is tetragonal and / or hexagonal.

This composite catalyst comprises: a solid oxide catalyst provided with a stabilized zirconia support and an active metal supported on the stabilized zirconia support; and a zeolite. The stabilized zirconia support has a tetragonal and / or cubic crystal structure in which a stabilizing element forms a solid solution with zirconia, and the active metal includes Fe and an alkali metal. The zeolite includes at least a zeolite that has one skeleton structure selected from the group consisting of MFI structure, MOR structure, CHA structure, FER structure, AEI structure, BEA structure, and FAU structure.

This invention relates to a nonlinear optical crystal of guanidinoacetic acid chloride, its preparation method, and its uses. The crystal has the molecular formula C3N3O2H8Cl, a molecular weight of 153.57, belongs to the tetragonal crystal system, and has a space group of [missing information]. I 2 d The unit cell parameters are a =15.7150(13)Å, b =15.7150(13)Å, c =11.0742(15)Å, α =90.00° β =90.00° gamma =90.00° Z =16, V =2734.9(6)Å 3 Centimeter-sized crystals were grown using evaporation, aqueous solution cooling, or hydrothermal methods. Under 1064 nm laser irradiation, the crystal exhibited a frequency doubling response similar to that of potassium dihydrogen phosphate. The ultraviolet absorption edge of the crystal was approximately 250 nm, and the experimental birefringence was approximately 0.08 at 546 nm. This crystal preparation method is simple and low-cost, possesses significant nonlinear optical effects, a large birefringence, a wide transmission range, and is easy to grow and process. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention discloses a Cu4 cluster catalytic material with synergistic dual catalytic sites and its application in the hydroboration reaction, belonging to the interdisciplinary field of coordination chemistry and nanomaterials. This copper cluster, using N-heterocyclic thiones (methimazole) as protecting ligands, is synthesized in high yield via a simple one-pot method. The chemical formula of the cluster is: C 16 H 20 Cu4N8S4, abbreviated as Cu4NC, belongs to the tetragonal crystal system and has a space group of 1. P 42 / n, a =10.01930(10)Å, b =10.01930(10)Å, c =11.6512(2)Å, α =90°, β =90°, gamma =90°, V =1169.62(3)Å 3 This catalyst utilizes the advantages of its synergistic dual catalytic sites to achieve highly efficient and selective catalytic hydroboration of alkynes. It exhibits excellent chemoselectivity (up to 100%), high efficiency (conversion number (TON) = 77786), high yield (up to 99%), a broad substrate range (28), mild conditions (room temperature and air), and high recovery rate, which are beneficial for the development of functionalized cluster catalysts.

The invention discloses A-site ion co-doping regulated scheelite molybdenum-based microwave dielectric ceramic and a preparation method, and belongs to the technical field of microwave dielectric ceramic. The composition expression of the microwave dielectric ceramic is Na (1-x) KxSr (1-x) BaxYbMo3O12, wherein x is more than or equal to 0.04 and less than or equal to 0.10. According to the invention, Na < + > and Sr < 2 + > of the ceramic are subjected to ion doping by regulating and controlling the molar ratio of four elements of K, Ba, Na and Sr, and the crystal structure, the sintering characteristic and the dielectric property of the ceramic are systematically optimized by virtue of an ion synergistic effect, so that the novel microwave dielectric ceramic which is more suitable for being applied to high-frequency communication devices is obtained. The prepared ceramic crystal structure belongs to a tetragonal crystal system I41 / a space group, the dielectric constant epsilon r is 9.32-10.64, the quality factor Qf is 96, 242-123, 076 GHz, and the temperature coefficient of resonance frequency tau f is-15.27--6.73 ppm / DEG C.

The invention discloses a preparation method of polyester based on a tetragonal system germanium dioxide catalyst. The preparation method comprises the following steps: binary acid and dihydric alcohol are taken as raw materials, esterification and polycondensation reaction are carried out in the presence of a catalyst, the catalyst adopted in the polycondensation reaction is tetragonal crystal system germanium dioxide, and the tetragonal crystal system germanium dioxide is synthesized by a hydrothermal method, has more oxygen vacancies and higher catalytic activity than traditional hexagonal crystal system germanium dioxide. The method provided by the invention can efficiently catalyze and synthesize PET. The obtained polyester product has high intrinsic viscosity, high light transmittance, low yellowness and excellent thermal stability, and the comprehensive performance of the polyester product is obviously superior to that of a product prepared by adopting a hexagonal crystal system germanium dioxide catalyst. The method is particularly suitable for producing high-end optical-grade polyester materials.

The present invention provides a β-cesium cadmium silicon sulfide compound, a β-Cs2CdSi4S10 infrared nonlinear optical crystal, as well as their preparation methods and applications. The β-cesium cadmium silicon sulfide compound has a chemical formula β-Cs2CdSi4S10 and a molecular weight of 755.04. The β-Cs2CdSi4S10 infrared nonlinear optical crystal belongs to the tetragonal crystal system, its space group is I-4, and its unit cell parameters are: a=8.4233(7) Å, c=14.6136(12) Å, and the unit cell volume is 1036.86(19) Å3. The present invention adopts a vacuum packaging method to prepare a β-Cs2CdSi4S10 infrared nonlinear optical crystal. By using the kurtz-berry method, it was found that the frequency doubling effect of β-Cs2CdSi4S10 crystal is approximately 1.1-1.2 times that of AgGaS2(AGS). By using the UV-visible diffuse reflection, it was found that the β-Cs2CdSi4S10 crystal has the crystal bandgap of 4.21 eV, the UV cutoff edge of 254 nm, and the infrared transparency range greater than 13 μm. The preparation method of the β-Cs2CdSi4S10 infrared nonlinear optical crystal of the present invention is simple, with a short growth period, and avoids the leakage and contamination of raw materials. The β-Cs2CdSi4S10 infrared nonlinear optical crystal of the present invention can be used to fabricate conversion devices for high-power laser output applications and has important applications in atmospheric remote sensing and communication fields.

A method of preparing bismuth vanadate particles is described. The bismuth vanadate particles prepared via ultrasonication and hydrothermal treatment exhibit controlled morphology (e.g., octahedral shape) and crystallinity (e.g., tetragonal crystal symmetry). A photoelectrode containing bismuth vanadate particles and a method of using the photoelectrode in a photoelectrochemical cell for water splitting is also provided.

To provide a film deposition method for depositing a metal oxide film having a high dielectric constant, a film deposition apparatus, and a semiconductor device.SOLUTION: The film forming apparatus includes a film forming unit configured to form a metal oxide film, and a doping unit configured to the metal oxide film with a dopant such that an energy difference obtained by subtracting an energy at which a crystal structure of the metal oxide film becomes monoclinic from an energy at which the crystal structure of the metal oxide film becomes tetragonal is lower than an energy difference in the metal oxide film in an undoped state.SELECTED DRAWING: Figure 5

Memory devices that include a pyroelectric layer between two metal layers. The pyroelectric layer may have a crystal configuration that is temperature-dependent. Different crystal configurations have different degrees of polarization. A higher temperature causes a pyroelectric material to have an orthorhombic crystal structure, which has a lesser degree of polarization, leading to lower power consumption and lower leakage. A lower temperature causes the pyroelectric material to have a tetragonal crystal structure, which has a higher degree of polarization, leading to higher power consumption, along with faster switching speed and better memory retention.

The invention discloses a high-purity green luminescent and high-optical temperature measurement sensitivity material and a preparation method thereof, and belongs to the technical field of optical luminescent materials. The chemical general formula of the high-purity green luminescence and high-optical temperature measurement sensitivity material is NaBi < 0.89-x > Yb < 0.1 > Er < 0.01 > Ca < x > (MoO4) 2, x is equal to 0.01-0.10, the material is a tetragonal system, the space group is I41 / a, rare earth erbium ions (Er < 3 + >) are used as active ions, rare earth ytterbium ions (Yb < 3 + >) are used as sensitizing ions, and green up-conversion emission near 530 nm and 550 nm can be generated under near-infrared excitation; the Er < 3 + > upconversion green emission ratio and the green light purity are improved by introducing non-equivalent ions Ca < 2 + > to regulate and control a matrix lattice environment and a charge compensation state, and meanwhile, the optical temperature measurement sensitivity based on the thermal coupling energy level is remarkably enhanced, so that the Er < 3 + > upconversion green emission compound has potential and wide application value in the fields of high-purity green light emission and optical temperature measurement.

A multiphase particulate nanocomposite material comprising, as determined by X-ray diffraction: a monoclinic CuO crystalline phase; an orthorhombic CaB2O4 crystalline phase; an orthorhombic PbO crystalline phase; an orthorhombic Pb4O(BO3)2 crystalline phase; a tetragonal Pb3O4 crystalline phase, and, a PbB2O4 crystalline phase. The multiphase particulate nanocomposite material has, based on the total number of atoms in the nanocomposite material: an atomic concentration of boron (B) is from about 1 to about 10 atom %; an atomic concentration of calcium (Ca) is from about 5 to about 15 atom %; an atomic concentration of copper (Cu) is from about 5 to about 15 atom %; and, an atomic concentration of lead (Pb) is from about 5 to about 15 atom %.