59 results about "Tetragonal crystal system" patented technology

This invention relates to a compound, magnesium gallium selenide (MgHgGa4Se8), and a magnesium gallium selenide (MgHgGa4Se8) infrared nonlinear optical crystal, along with their preparation methods and applications. The compound has the molecular formula MgHgGa4Se8 and a molecular weight of 1135.46 g / mol. The crystal, also with the molecular formula MgHgGa4Se8 and a molecular weight of 1135.46 g / mol, lacks a center of symmetry, belongs to the tetragonal crystal system, and has a space group of MgHgGa4Se8. Its cell parameters are α = β = γ = 90°, Z = 1, and its volume is determined by the high-temperature melt method, chemical vapor transport method, or crucible lowering method. This crystal exhibits advantages such as significant nonlinear optical effects, good crystal growth habit, good mechanical properties, high hardness, resistance to breakage and deliquescence, and ease of processing and storage. It can be used to fabricate infrared nonlinear optical devices, which have important applications in optoelectronic warfare, laser communication, and medical fields.

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.

The invention discloses a wavelength selective photoresponse strontium-based metal organic framework eutectic material as well as a preparation method and application thereof. A metal node of the material is strontium ions, N, N '-bis (5-isophthalic acid) naphthalimide is used as a ligand, anthracene and a derivative thereof are used as objects, N, N-dimethylformamide is used as a solvent, and the material is obtained through solvothermal reaction. The material is composed of an electron donor (D) and an electron acceptor (A), and is a strontium-based MOF eutectic with an infinitely extended pi stacked A-D-D-A configuration. The MOF eutectic material has lattice characteristics of a tetragonal crystal system, a space group is I 41 / a, and cell parameters are a = b = 28.42240 (10), c = 13.71600 (10), and alpha = beta = gamma = 90 degrees. Sr-NDI at An has unique wavelength selective photoresponse property: ultraviolet light triggers [4 + 4] dimerization of an object anthracene, red light excites [4 + 2] reaction of anthracene and singlet oxygen, and near-infrared light induces generation of free radicals.

Semiconductor devices are provided. The semiconductor devices includes a landing pad on a substrate, a lower electrode on the landing pad and connected to the landing pad, a capacitor dielectric film that is on the lower electrode and includes both a tetragonal crystal system and an orthorhombic crystal system, a first doping layer that is between the lower electrode and the capacitor dielectric film and includes a first metal, and an upper electrode on the capacitor dielectric film.

The invention discloses a sulfur-arsenic-strontium-sodium compound and a sulfur-arsenic-strontium-sodium nonlinear optical crystal as well as a preparation method and application thereof. The chemical formula of the sulfur-arsenic-strontium-sodium nonlinear optical crystal is Na4SrAs2S8, the sulfur-arsenic-strontium-sodium nonlinear optical crystal is of a non-centrosymmetric structure and belongs to a tetragonal system, and a space group is that cell parameters are alpha = beta = gamma = 90 degrees, Z = 2 and V = 701.57 (5). The sulfur-arsenic-strontium-sodium nonlinear optical crystal provided by the invention has a relatively large nonlinear optical coefficient and relatively wide transmission wave band and band gap. Meanwhile, the crystal meets the same-component melting characteristic, is easy to grow, cut, grind, polish and preserve, is stable in air, is not easy to deliquesce and is insoluble in water, so that the crystal is expected to become a new-generation novel middle-infrared band nonlinear optical material with excellent comprehensive performance, and can be effectively applied to a wide-spectrum-range tunable laser system.

The present invention relates to the application of a methylene diboric acid second-order nonlinear optical crystal material in the field of nonlinear optics. The chemical formula of the crystal material is CH6B2O4, the molecular weight is 103.68, it belongs to the tetragonal crystal system, its space group is I41md, the unit cell parameters are α=β=γ=90°, Z=4, and the unit cell volume is . The methylene diboric acid crystal material of the present invention has excellent optical properties. Under 1064nm laser irradiation, the powder frequency harmonic intensity is approximately 0.3 times that of potassium dihydrogen phosphate crystal, and phase matching can be achieved. In addition, the single crystal preparation method of the second-order nonlinear optical material is simple, and its ultraviolet absorption cutoff edge is less than 190nm. These advantages make it have important application potential in the fields of laser frequency conversion, optical information processing, holographic storage, and optical communication.

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.

The invention discloses a lithium supplement additive of a lithium ion battery for a positive electrode and a preparation method and application of the lithium supplement additive. The chemical formula of the positive electrode lithium supplement additive is Li6ZnO4, and the positive electrode lithium supplement additive belongs to a tetragonal system and has an anti-fluorite structure of a P42 / nmc space group. Uniformly mixing a lithium source and a zinc-containing oxide according to a stoichiometric ratio to form a mixture; and placing the mixture in a tubular furnace, heating to 700-1000 DEG C in an inert atmosphere or a reducing atmosphere, keeping the temperature for 10-30 hours, and reacting to obtain Li6ZnO4. The material prepared by the method has the remarkable advantages of small particle size, fine material morphology, uniform distribution, high charging specific capacity and the like, the irreversible loss of active lithium caused by the formation of a solid electrolyte interface (SEI) is effectively avoided, and meanwhile, the generation of side reaction products is inhibited.

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 purpose of the present invention is to provide a piezoelectric element with which it is possible to achieve both a high electromechanical coupling coefficient and a high coercive electric field and to cope with a broader range of perovskite-type oxide single crystals. A piezoelectric element according to the present invention has a single crystal of a perovskite-type metal oxide and electrodes facing each other, the piezoelectric element being characterized in that when the environmental temperature is 25°C, the crystal system of the single crystal is a tetragonal system, and the crystal orientation of the surfaces of the single crystal in contact with the electrode surfaces of the electrodes facing each other is (110) or (111).

Embodiments of the present disclosure provide a semiconductor structure and a manufacturing method thereof. The manufacturing method includes: providing a base; forming a bottom electrode layer on the base, wherein a crystal structure of the bottom electrode layer includes a tetragonal crystal system; forming a first dielectric layer on a surface of the bottom electrode layer by using the bottom electrode layer as a seed layer, wherein a crystal structure of the first dielectric layer includes a tetragonal crystal system; and forming a first current blocking layer on a surface of the first dielectric layer.

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.

A Mg0.6Ti2.4O5 / MgTiO3 / tetragonal TiO2 / orthorhombic TiO2 / CdO / C nanocomposite material includes an orthorhombic Mg0.6Ti2.4O5 phase; a hexagonal magnesium titanate (MgTiO3) phase, a tetragonal titanium dioxide (TiO2) phase, a cubic cadmium Oxide (CdO) phase, and an orthorhombic TiO2 phase. The Mg0.6Ti2.4O5 / MgTiO3 / Tetragonal TiO2 / Orthorhombic TiO2 / CdO / C nanocomposite material has a granular morphology including spherical particles having an average particle diameter ranging from 50 nanometer (nm) to 130 nm. Furthermore, a method of production includes calcination of metal precursors.

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.

The present invention relates to a molybdenum strontium peroxide second-order nonlinear optical crystal and its preparation and application. The chemical formula of the crystal material is SrMo2O3(O2)4(H2O)2·3H2O, the molecular weight is 545.58, it belongs to the tetragonal crystal system, its space group is , the unit cell parameters are α=β=γ=90°, Z=8, and the unit cell volume is . The molybdenum strontium peroxide crystal material of the present invention has excellent optical properties. Under 1064nm laser irradiation, the powder frequency harmonic intensity is about 3 times that of potassium dihydrogen phosphate crystal, and phase matching can be achieved. The crystal material is not only easy to grow, but also can effectively expand the wavelength range of coherent light sources through optical frequency conversion technologies such as second harmonic generation and optical parametric amplification. In the fields of laser lithography, laser processing, medical diagnosis and treatment, this crystal material shows important application prospects.

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 porous particulate nanocomposite material containing, as determined by X-ray diffraction: a cubic Zn2Ti3O8 crystalline phase; a tetragonal PbTiO3 crystalline phase; and, an orthorhombic TiO2 crystalline phase. In the porous particulate nanocomposite material, based on the total number of atoms in the nanocomposite material: the atomic concentration of titanium (Ti) is from about 15 to about 25 atom %; the atomic concentration of zinc (Zn) is from about 5 to about 15 atom %; and, the atomic concentration of lead (Pb) is from about 15 to about 25 atom %.

The invention relates to a selenium-gallium-mercury-magnesium compound and a selenium-gallium-mercury-magnesium infrared nonlinear optical crystal as well as a preparation method and application thereof, the molecular formula of the compound is MgHgGa4Se8, the molecular weight of the compound is 1135.46 g / mol, the molecular formula of the crystal is MgHgGa4Se8, the molecular weight of the crystal is 1135.46 g / mol, the crystal has no symmetry center and belongs to a tetragonal crystal system, the space group is # imgabs0 #, the cell parameters are as follows: # imgabs1 # and # imgabs2 #, alpha = beta = gamma = 90 degrees, Z = 1, and beta = gamma = 90 degrees. And the crystal is prepared by adopting a high-temperature melt method, a chemical vapor transport method or a Bridgman-Stockbarger method, wherein the volume of the crystal is # imgabs3 # and # imgabs4 #. The crystal has the advantages of being large in nonlinear optical effect, good in crystal growth habit, good in mechanical performance, large in hardness, not prone to fragmentation and deliquescence, easy to process and store and the like, can be used for manufacturing infrared nonlinear optical devices, and has important application in the fields of photoelectric countermeasure, laser communication, medical treatment and the like.

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.