55 results about "Hexagonal crystal system" patented technology

The invention discloses a double transition metal doped graphene catalyst and application thereof, the double transition metal doped graphene catalyst is of a hexagonal crystal system structure, and the space group is P6 / mmm; the composition form of the active center is Cu2C3N3, Nb2C3N3, Ta2C3N3, Rh2C6, Rh2C3N3 and Rh2N6, the hydrogen evolution free energy of the active center is-0.03 eV,-0.09 eV, 0.10 eV, 0.12 eV,-0.21 eV and 0.06 eV respectively, the metal binding energy of the active center is-4.53 eV,-8.60 eV,-8.03 eV,-6.13 eV,-7.11 eV and-5.62 eV respectively, the metal forming energy of the active center is-0.54 eV,-1.94 eV,-0.06 eV,-0.64 eV,-1.62 eV and-0.13 eV respectively, and the active center has good catalytic activity, structural stability and preparation feasibility and is used for

The invention discloses a preparation method of a manganese-doped iron-based sulfide / nitrogen-doped reduced graphene oxide composite electrode material for a sodium-ion battery, a simple solvothermal method is combined with annealing treatment, and iron atoms in a hexagonal system are replaced by part of manganese atoms in a hydrothermal process to form multivalent iron-based sulfide, so that the composite electrode material is prepared. The manganese-doped iron-based sulfide / nitrogen-doped reduced graphene oxide composite electrode material for the sodium-ion battery is successfully prepared by uniformly compounding the manganese-doped iron-based sulfide and the nitrogen-doped reduced graphene oxide, and the manganese-doped iron-based sulfide / nitrogen-doped reduced graphene oxide composite electrode material can effectively regulate and control the electronic state density, reduce the sodium ion migration energy barrier and promote the electron / ion transmission; meanwhile, continuous growth of iron-based sulfide particles is limited, so that the iron-based sulfide particles are uniformly dispersed on the surface of the graphene, more active sites are exposed, the electrochemical reaction activity is improved, and the structural stability is enhanced. The composite electrode material disclosed by the invention can be widely applied to a negative plate for a sodium-ion battery, and has excellent adaptability and application prospect in a wide temperature range and under a high-current working condition.

The invention provides a sodium-ion battery positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of sodium-ion batteries. The chemical formula of the positive electrode material is NamAxByCzFe (0.5-x-y) Mn (0.5-z) O2, m is 0.67-1.0, x + y is equal to 0.05-0.2, z is equal to 0.01-0.05, and A, B and C are different elements and are respectively selected from one of Li, Al, Mg, Si, Ti, Cr, Co, Ni, Cu, Zn, Zr and Sn. The positive electrode material is a P2-type ferro-manganese-based layered oxide, is a P2-phase hexagonal crystal system and contains a plurality of superlattice elements; according to the multiple superlattice elements, A, B and C atoms serve as centers, the peripheries of the A, B and C atoms are surrounded by six Mn atoms, and three honeycomb-shaped superlattice elements are formed in the crystal. The sodium ion layered positive electrode material provided by the invention is good in structural stability, high in capacity, good in cycling stability and excellent in rate capability.

The invention discloses a novel intermediate infrared double-core photonic crystal fiber polarization beam splitter based on aluminum wire filling, particularly relates to the technical field of photonic crystal fiber polarization beam splitters, and solves the technical problem that in the prior art, a compact photonic crystal fiber polarization beam splitter with a high extinction ratio and an ultra wide band in an intermediate infrared band is still scarce. According to the technical scheme, the optical fiber comprises two fiber cores and a cladding, wherein a cladding area is distributed in a hexagonal lattice mode; a plurality of circular air holes and two large circular filling holes are formed in the fiber core area, the distance between every two adjacent air holes is the same, the fiber core area comprises four small circular air holes and a central air hole, and the fiber cores are arranged in parallel and symmetrically distributed on the two sides of the central air hole. The As2S3 glass with high refractive index is used as a substrate material, aluminum is used as a metal filler, and the shortest length of 160 microns, the maximum extinction ratio of-72.1 dB and the operation bandwidth of 1020 nm are obtained at the mid-infrared band with the wavelength of 3.3 microns.

The invention provides a chromium-titanium bimetallic layered sulfide positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The chemical general formula of the material is LiCrxTiyS2, x + y = 1, the material belongs to a hexagonal crystal system O1 type structure, and the space group is Pm1. Microtopography analysis shows that the material is granular, the particle size distribution is 2-15 [mu] m, the particle surface has a layered structure characteristic, and each element is uniformly distributed on the particle surface and in a bulk phase. The capacity of the material mainly comes from oxidation reduction between titanium and sulfur, and chromium has the effect of stabilizing a structural framework and does not participate in the charge compensation process. Electrochemical analysis shows that the reversible capacity of the LiCr2 / 3Ti1 / 3S2 positive electrode material reaches up to 223 mAh g <-1 > and is close to the theoretical value of the positive electrode material of the system. In addition, the material shows excellent rate capability and cycling stability, and still keeps the capacity retention ratio of 80% after 330 times of cycling.

The invention discloses a high-entropy O3 phase layered oxide material, a preparation method, application and a battery. The chemical formula of the material is Na < 1-x-y > Ca < y > Li Ni Cu < c > Fe < d > Co < e > Mn < f > Ti < g > O < 2 >, the material belongs to a hexagonal system, and the space group is R-3m; wherein 0 lt; x is less than or equal to 0.1, 0lt; a + b + c + d + e + f + g = 1, 0 < a < = 0.1, 0.15 < = b < = 0.3, 0 < c < = 0.1, 0.08 < = d < = 0.25, 0 < e < = 0.08, 0.3 < = f < = 0.5, and 0 < g < = 0.1. The high-entropy O3-phase layered oxide material prepared by the invention has relatively good structural stability and air stability, and the preparation method is simple and easy for large-scale production; the sodium ion battery formed by using the lithium ion battery positive electrode material as a positive electrode active material has the characteristics of high cycling stability, high rate capability and fast charge.

The invention provides a cage-mesh-structure ferromagnet with a large anomalous Hall effect and a preparation method thereof.The preparation method comprises the steps that raw materials including Tb, Mg, Mn and Sn elementary substances are contained in an Al2O3 crucible, sealed in a quartz tube in a vacuum mode and smelted in a muffle furnace, and finally the cage-mesh-structure ferromagnet with the large anomalous Hall effect is obtained through centrifugal separation of a fluxing agent Sn; the Tb-xMgxMn6Sn6 has the structural characteristic that Tb in TbMn6Sn6 is substituted by Mg, and the expression of the Tb1-xMgxMn6Sn6 is Tb1-xMgxMn6Sn6, xlt; and 0.2 part. The Tb < 1-x > Mg < x > Mn < 6 > Sn < 6 > is a hexagonal crystal system, the space group is P6 / mmm, the Tb < 1-x > Mg < x > Mn < 6 > Sn < 6 > has metallic luster, the thickness is 0.1-0.5 mm, and the side length of the hexagon is 1-3mm; the single crystal shows ferrimagnetism at room temperature and has a large abnormal Hall effect at low temperature. Abnormal Hall resistivity of Tb0. 986Mg0. 014Mn6Sn6 at 3K is about # imgabs0. Abnormal Hall conductivity of # imgabs1 # imgabs2 # Tb0. 96Mg0. 04Mn6Sn6 at 3K is about # imgabs3 # imgabs4 #, and abnormal Hall conductivity of # imgabs5 # is about 1 # imgabs2 # Tb0. 96Mg0. 04Mn6Sn6 at 3K

The invention relates to a graphite paper-based zinc negative electrode and a preparation method and application thereof, and belongs to the technical field of novel battery energy storage. The preparation method of the graphite paper-based zinc negative electrode comprises the following steps: by taking graphite paper as a negative electrode, a zinc foil as a positive electrode and a zinc salt aqueous solution as an electrolyte, carrying out electro-deposition by applying constant current, so that zinc ions are subjected to reduction reaction on the surface of the graphite paper to form a zinc deposition layer, and the graphite paper-based zinc negative electrode is obtained. The graphite paper substrate and a hexagonal crystal system of zinc have good lattice matching performance, and zinc can be induced to preferentially deposit along the (002) crystal face. The Zn (002) crystal face has higher electrochemical stability and lower interface energy, and dendritic crystal growth and side reaction are effectively inhibited. Compared with a traditional copper foil substrate, the surface of a zinc deposition layer of the graphite paper substrate is uniform and compact, is rich in metallic luster and has no obvious dendritic crystal protrusions.

The invention provides a two-dimensional material solar hydrogen production efficiency prediction method and device based on machine learning. The method comprises the following steps: reading a non-magnetic hexagonal crystal system single-layer material in a database to construct an initial data set; for samples with complete labels in the data set, training a single-layer material band edge position prediction model by adopting a feature engineering and gradient boosting decision tree algorithm; next, predicting and complementing samples with missing labels by using the trained model so as to generate a complete data set and further construct heterojunction double layers; carrying out data enhancement on a heterojunction sample of literature investigation through a CVAE-GAN hybrid architecture, and optimizing a feature vector; then training the new model by adopting a random forest algorithm to realize accurate prediction of the band edge position of the previously constructed heterojunction; and finally, the heterojunction type is judged in combination with a work function and a band edge position, the solar hydrogen production efficiency is calculated in batches by utilizing a program, and a high-efficiency heterojunction material is screened out.

The invention relates to a preparation method of a near-infrared luminous AgPd super-atomic cluster and application of the near-infrared luminous AgPd super-atomic cluster in 3D printing, and belongs to the crossing field of coordination chemistry and nano materials. The chemical formula of the AgPd super-atomic cluster is C216H150Ag14F30P10PdS6 (abbreviated as Ag14Pd), the AgPd super-atomic cluster belongs to a hexagonal crystal system, and the space group is a chiral space group R3 () c. The cluster has strong near-infrared luminescence at room temperature, wherein the optimal emission wavelength in a solid state is 780 nm; the optimal emission wavelength in a solution state is 768nm; the maximum light-emitting quantum yield in a solid state reaches up to 15%. In addition, the super-atomic cluster also shows excellent thermal stability. The cluster has high optical activity and solubility at room temperature, can be used as ink for 3D printing to print macroscopic models of various shapes and sizes, and shows that the near-infrared luminous cluster material has potential application prospects in photoelectric devices.

The invention discloses a nanorod-shaped Cu1.8 S material as well as a preparation method and application thereof. The preparation method comprises the following steps: adding ascorbic acid into a copper ion solution, then adding Na2S or K2S, stirring for reaction, centrifuging and washing to obtain a nanorod-shaped Cu1.8S material; the pH value of the copper ion solution is 2-4. The nanorod-shaped Cu1.8S material belongs to a hexagonal crystal system, the center of Cu and S atoms of the first coordination form three Cu-S coordination with the average bond length of # imgabs0 #, the synthesized material conforms to the crystal form characteristics of Cu1.8S, and the material has application prospects in thermoelectricity, photocatalysis and water treatment.

The application discloses a low-frequency broadband seismic metamaterial filled with a five-mode dot array core and a design method thereof. The seismic metamaterial is composed of a five-mode dot array core, a concrete hollow pipe and an outermost soil layer. The five-mode dot array core is composed of a plurality of hexagonal crystal system units arranged periodically. The hexagonal crystal system unit is connected by an axial direction and is obtained by space structure conversion. The hexagonal crystal system unit is arranged periodically to form a three-dimensional dot array core structure composed of a plurality of hexagonal crystal system units. The low-frequency broadband seismic metamaterial filled with the five-mode dot array core can form a low-frequency broadband in a target frequency band. The seismic metamaterial is arranged in a vibration isolation area underground. When a seismic Rayleigh wave propagates to the area, the wave energy is significantly weakened under the action of a forbidden band, so that effective isolation and attenuation of the Rayleigh wave can be realized under the condition of a limited space.

The invention belongs to the technical field of new materials, and discloses a preparation method and application of a stimuli-responsive flexible two-dimensional zinc-based complex. The structural unit of the complex is [Zn2 (OH) 2 (H2L1) 4], Zn is a divalent zinc ion, H2L1 represents a ligand: 4, 4 '-(2, 2-di-p-methylphenyl ethylene-1, 1-diyl) dibenzoic acid, and a ligand: 4, 4'-(2, 2-di-p-methylphenyl ethylene-1, 1-diyl) dibenzoic acid; wherein the structure of the two-dimensional zinc-based complex belongs to a hexagonal crystal system and a P-3 space group, and the cell parameters of the two-dimensional zinc-based complex are as follows: the axial length is # imgabs 0 # # imgabs 1 #, the axial angle is alpha = beta = 90 degrees, gamma = 120 degrees, and the cell volume is # imgabs 2 # Z = 6. Based on tetraphenylethylene (TPE), a material structure is constructed by modifying a functional methyl functional group on a benzene ring serving as a rotor group. The H2L1 contains two active benzene rings with methyl, and the benzene rings can still perform internal molecular movement even after forming a complex, so that the H2L1 is not limited. Therefore, the two-dimensional zinc-based complex can show stimulus-responsive structure reversible conversion during gas molecule adsorption, so that gas is specifically adsorbed. The two-dimensional zinc-based complex has the potential to be applied to the field of low-carbon hydrocarbon gas separation.

This invention relates to a germanium-based chiral perovskite second-order nonlinear optical crystalline material, its preparation and application, wherein the chemical formula of the material is ( R -C7H 10 NO)GeI3 and ( S -C7H 10 NO)GeI3, where R -C7H 10 NO is a (R)-2-(1-hydroxyethyl)pyridine cation. S -C7H 10 NO is a (S)-2-(1-hydroxyethyl)pyridine cation. This crystal belongs to the hexagonal crystal system, space group [space group number missing]. P 63, cell parameters a =17.0~18.0 Å, b =17.0~18.0 Å, c =7.0~8.0 Å, unit cell volume V =2000~2200 Å 3 , α = β =90°, gamma =120° Z= 2. Under 1200 nm laser irradiation, the nonlinear optical crystal of the present invention ( R -C7H 10 NO)GeI3 and ( S -C7H 10 The frequency doubling effect of GeI3 powder is 15 times that of KH2PO4; under 2000 nm laser irradiation, the frequency doubling effect of the crystalline material powder is 1.0 times that of KTiOPO4, and both can achieve phase matching. The crystalline material also has a large birefringence, wherein ( R -C7H 10 NO)GeI3 is 0.518 @ 546 nm, ( S -C7H 10 The NO)GeI3 has a wavelength of 0.529 nm at 546 nm and a moderate optical band gap (2.68 eV). The crystalline material of this invention shows significant engineering application value in nonlinear optical applications such as near-infrared laser frequency conversion, optical parametric amplification, and electro-optic signal processing.

The invention discloses a Cr < 3 + > doped phosphate broadband near-infrared fluorescent powder and a preparation method thereof, and relates to the technical field of luminescent materials, the crystal structure of a matrix lattice of the near-infrared fluorescent powder belongs to a hexagonal system, the space group is R-3c (167), the chemical general formula is M < 2-y > Al < 1-x-y > Ti < 1 + y > (PO4) 3: xCr < 3 + >, M is at least one of L , Na and K, x and y are mole fractions and 0 lt respectively, and x is 0 lt. 0 < = y < = 1; the preparation method comprises the following steps: respectively weighing compounds containing elements according to the stoichiometric ratio, uniformly mixing, roasting in a high-temperature box-type furnace, and grinding after the product is cooled to obtain the near-infrared fluorescent powder. The near-infrared fluorescent powder prepared by the invention has excellent luminescence property and stability, wide emission wavelength coverage range and good application prospect, can be effectively excited by a blue light LED chip, realizes broadband near-infrared emission of 700nm-1300nm, can be used as a light conversion material of the blue light LED chip, and is simple in preparation process and stable and reliable in product quality.

The present invention relates to alkaline earth metal magnesium-based sulfide (selenium) compounds and alkaline earth metal magnesium-based sulfide (selenium) nonlinear optical crystals and preparation methods and uses thereof. The chemical formula of the series of compounds and crystals is AMg. 6 Ga 6 Q 16 , where A = Ca, Sr, Ba, Pb; Q = S, Se, all belong to the hexagonal system, and the space group #imgabs0# unit cell parameters are #imgabs1##imgabs2#α=β=90°, γ=120°, Z=3. Alkaline earth metal magnesium-based chalcogen (selenium) compounds are synthesized by vacuum high-temperature solid-phase reaction method, and alkaline earth metal magnesium-based chalcogen (selenium) crystals are grown by high-temperature solution method or Bridgman method. This material can be used to manufacture second harmonic generators, up and down frequency converters, optical parametric oscillators, etc.

The application discloses a method for preparing hexagonal hydroxyl carbonate lanthanum by hydrothermal synthesis, which comprises the following steps: diluting lanthanum chloride solution as a bottom liquid with deionized water and adding lanthanum carbonate as a crystal seed in a precipitation reactor; adding a feed liquid and a precipitator into the precipitation reactor by using a parallel flow precipitation mode, generating lanthanum carbonate after precipitation reaction, controlling the input speed of the feed liquid and the precipitator to control the precipitation reaction time and adjust the pH value; taking out the precipitate lanthanum carbonate in the precipitation reactor, drying after filtration to obtain lanthanum carbonate as a precursor; adding the lanthanum carbonate and deionized water into a reactor to perform a hydrothermal synthesis reaction, washing the obtained final product with deionized water, and performing suction filtration or centrifugation to obtain a white solid; and placing the white solid in an oven, drying to obtain hexagonal hydroxyl carbonate lanthanum. The production process is simple, and the method is suitable for industrialized batch production of hexagonal hydroxyl carbonate lanthanum.

The invention relates to iron phosphate and a preparation method thereof, and a graded iron phosphate and lithium iron phosphate positive electrode material, the iron phosphate is hexagonal crystal system anhydrous iron phosphate, and the crystallinity is more than 98%; the particle size Dv10 of the iron phosphate is more than or equal to 0.5 mu m, the particle size Dv50 is 1.6 mu m-2 mu m, the particle size Dv90 is less than or equal to 5 mu m, and ((Dv90-Dv10) / Dv50) is less than or equal to 2.22; the tap density is 1g / cm < 3 >-1.2 g / cm < 3 >, the specific surface area is 1m < 2 > / g-3. 0m < 2 > / g, the atomic ratio of iron to phosphorus is 0.97 or above, and the sphericity is 0.806 or above; the iron phosphate is high in sphericity degree, high in dispersity among particles and easier to disperse in the lithium iron phosphate preparation process, and a better grading effect is formed; the iron phosphate is low in specific surface area, good in fluidity, easier to filter and not prone to agglomeration; the particle size of iron phosphate is small, so that the grading structure is more compact, and the method is suitable for preparing the high-pressure and high-energy-density lithium iron phosphate positive electrode material.

The application discloses a rare earth magnesium gallium sulfur bifunctional material, a crystal thereof, a preparation method and application. The material has a chemical formula of LnMg6Ga6S 16 , wherein Ln is Nd or Sm, is crystallized in a hexagonal crystal system, and has a space group of P-6; the unit cell parameters of NdMg6Ga6S 16 are a=b=16.6585 Å, c=7.4046 Å; the unit cell parameters of SmMg6Ga6S 16 are a=b=16.653 Å, c=3.702 Å. The material has nonlinear optical performance and near-infrared luminescence performance. The polycrystalline powder of the material can be prepared by a vacuum high-temperature solid phase reaction method, and the crystal can be grown by a high-temperature melt method or a crucible lowering method. The obtained crystal can be used for preparing nonlinear optical devices such as a laser frequency doubling generator, a frequency converter, an optical parametric oscillator or an optical parametric amplifier, and can also be used for preparing near-infrared luminescence devices such as a near-infrared luminescence diode or a near-infrared laser.

The invention discloses a semiconductor device, a power module, a power conversion circuit, a vehicle and a manufacturing method of the semiconductor device, and the semiconductor device comprises a semiconductor body which comprises a well region and a first region, the first region is arranged on a first surface, the well region is arranged on one side, far away from the first surface, of the first region, and the first region is of a first conductivity type; the well region is of a second conductive type; the first surface is provided with a gate trench, the side walls of the gate trench comprise a first side wall and a second side wall, the two side walls are parallel to each other and are respectively in contact with the well region and the first region, and the first side wall and the second side wall belong to a (0338) crystal plane family or a (1120) crystal plane family under the condition of a hexagonal crystal system; the insulating layer is positioned on the bottom wall and the side wall of the gate trench; the grid electrode is positioned on one side, far away from the semiconductor body, of the insulating layer in the grid groove; the source electrode is located on the first surface; the drain electrode is located on the second surface. The first side wall and the second side wall of the gate trench have high electron mobility at the same time, so that the semiconductor device has low on-resistance and high current.

The invention relates to a normal-temperature and normal-pressure high-conductivity micro-nano material based on copper-doped lead apatite as well as preparation and application thereof. The chemical general formula of the material is Pb10-XCux (PO4) 6O, x is more than 0.95 and less than 1.05, the material has a hexagonal system apatite structure, Cu < 2 + > occupies a lattice 4f site and forms a [CuO5] pyramid unit, strong electroacoustic coupling is realized through Jahn-Teller distortion, and the material shows excellent conductivity at normal temperature and normal pressure. The room temperature resistivity of the material is less than or equal to 0.05 mu omega.cm, the critical current density is greater than or equal to 1.2 * 10 < 6 > A / cm < 2 >, and the sulfur impurity content is less than or equal to 0.05 at% The invention further discloses a gradient sulfur control heat treatment method, and the purity and the conductive stability of the material are remarkably improved. The material is suitable for a power transmission system, is particularly suitable for a high-conductivity component without cooling, and has the advantages of high current carrying capacity, high environmental resistance, low cooling cost and the like.

This invention relates to a series of alkali metal rare earth chalcogenides and a series of alkali metal rare earth chalcogenide nonlinear optical crystals, their preparation methods, and their applications. The general chemical formula for both the series of halides and the nonlinear optical crystals is A3Ln. 11 Ga 19 Q 45 X3, where A = K, Rb, Cs; Ln = La, Pr, Nd; Q = S, Se; X = Cl, Br, I, all belong to the hexagonal crystal system with space group and cell parameter Z = 1. This series of halides is synthesized using a high-temperature solid-state method, while this series of nonlinear optical crystals is grown using a high-temperature solution method or the Bridgman process. This material can be used to manufacture second harmonic generators, up- and down-frequency converters, optical parametric oscillators, etc.

The invention discloses an acetylene gas sensor, and belongs to the technical field of gas detection, the acetylene gas sensor is made based on a photonic crystal fiber, a gas hole structure in the photonic crystal fiber is formed by six large elliptical gas holes and a plurality of small circular gas holes, and the six elliptical gas holes and the plurality of circular gas holes are periodically arranged. A hexagonal lattice of a target lattice period is formed to restrain a transmission light field, on one hand, light field regulation and gas adsorption are optimized by utilizing anisotropy and large inner surface area of six large oval air holes, and the performance is improved; on the other hand, the actual operation difficulty of internal film coating and sensitive material coating processes is greatly reduced due to the large pore size, accurate control over the thickness of the nanogold film and the thickness of the acetylene gas sensitive film is facilitated, the manufacturing complexity of the acetylene gas sensor based on the photonic crystal fiber is reduced, and the yield is increased.

The application relates to a compound arsenic-silicon-gallium-strontium and an infrared nonlinear optical crystal of arsenic-silicon-gallium-strontium, a preparation method and application, the compound has a molecular formula of SrGa3Si4As 11 , a molecular weight of 1233.26 g / mol, an asymmetric center, and is crystallized in a hexagonal crystal system P , a 63 space group, a cell parameter of a=b=9.2604(3) A, c=11.6484(5) A, Z=2, and V=865.08(7) A 3 , and is prepared into a crystal by using a high-temperature melt method, a chemical vapor phase transmission method or a flux method. The crystal has strong laser damage resistance, large nonlinear optical effect, wide infrared transmission range, and simultaneously has the advantages of large hardness, good mechanical property, not easy to break and deliquesce, easy to process and store and the like, and can be used for manufacturing infrared nonlinear optical devices.

This invention provides a three-dimensional covalent organic framework material, its preparation method, and its applications. The material is constructed by the condensation of biphenyl-3,3',5,5'-tetraaldehyde and p-phenylenediamine via imine bonds; it possesses a hexagonal crystal system, P6 space group, and a qtz topology with triple interpenetrating atom (AA) packing, and a BET specific surface area of ​​1408 m². 2 The material exhibits a high adsorption capacity ( / g), thermal stability up to 410℃; and at 298 K and 1.0 bar, it achieves an adsorption capacity of 18.8 mmol / g for pure NO2, 7.41 mmol / g for pure SO2, and 5.52 mmol / g for pure NH3. It can deeply purify 2500 ppm NO2 / SO2 to <0.1 ppm, with an NO2 / SO2 selectivity >5000. Under humid conditions, its NO2 capture efficiency not only does not significantly decrease but also shows a certain degree of improvement. Cyclic tests of the material's NO2 enrichment and conversion show excellent capture and conversion effects over three cycles, effectively converting captured NO2 into nitric acid. With its extremely high NO2 / SO2 / NH3 adsorption capacity, selectivity, and stability, it is suitable for the efficient capture and deep purification of toxic gases in the atmosphere.

The present invention relates to a potassium borate carbonate second-order nonlinear optical crystal material and its preparation and application. The chemical formula of the crystal material is K9[B4O5(OH)4]3(CO3)(BO2)·7H2O, the molecular weight is 1154.64, it belongs to the hexagonal crystal system, the space group is #imgabs0#, the unit cell parameters are #imgabs1#α=β=90°, γ=120°, Z=6, and the unit cell volume is #imgabs2#. The crystalline material contains isolated linear [BO2] ‑ The potassium borate carbonate crystal material of the present invention has excellent optical properties. Under 1064nm laser irradiation, the powder frequency-doubled intensity is about 1 times that of KH2PO4 (KDP) crystal, and phase matching can be achieved. In addition, the crystal material has the advantages of a wide light transmission band, stable physical and chemical properties, moderate mechanical hardness, easy growth, etc., and has important application value in optoelectronic fields such as lithography, spectral analysis, precision manufacturing and environmental monitoring.

A solid electrolyte material, preparation method and all-solid-state lithium-ion battery, belonging to the field of energy storage technology. The chemical formula of the solid electrolyte material is (Li 5‑x M x / a )Y(A 3‑y X y / b ), belonging to the hexagonal crystal system; wherein M is a cation with a valence of a, and Y, A, and X are all anions; M comprises one or more of H, Na, K, Rb, Mg, Ca, Sr, Ba, Zn, Al, Ga, Si, Ge, Sn, and P; Y is selected from at least one of O, S, and Se; A is selected from one of F, Cl, Br, and I; X has a valence of -b and is selected from at least one of F, Cl, Br, I, S, O, Se, N, OH, BF4, BH4, AlF4, and AlH4 different from A; 0≤x<5, 0≤y≤3. This solid electrolyte material has high ionic conductivity and can improve the electrochemical performance of a corresponding all-solid-state metal ion battery prepared using the solid electrolyte material.

The present application relates to the technical field of nano energy storage material preparation, and particularly relates to a two-dimensional molybdenum nitride and crystalline Mo2N nanosheet ammonia-free preparation method. A two-dimensional molybdenum boride compound derived from a rare earth molybdenum aluminum boride compound is used as a precursor to prepare two-dimensional molybdenum nitride and crystalline Mo2N nanosheet with a six-fold symmetric layered structure under an ammonia-free condition. A compound with a hexagonal crystal system formed by metal molybdenum, heavy rare earth metal, metal aluminum and boron is used as a precursor. After wet etching of an aluminum atom layer and a rare earth atom in the compound by using a fluorine-containing acid solution, intercalation and exfoliation are performed to form a two-dimensional derivative with a certain energy storage density. The two-dimensional derivative is annealed at different temperatures under nitrogen to control the atomic layer spacing, surface chemical state, surface functional group and chemical bond in the two-dimensional derivative, realize in-situ conversion from the two-dimensional molybdenum boride to the two-dimensional molybdenum nitride and crystalline Mo2N with a six-fold symmetric layered structure, and significantly improve the specific capacitance.

The invention discloses application of a hexagonal crystal system material GdAl3 (BO3) 4 in the field of extremely low temperature magnetic refrigeration, and relates to the technical field of magnetic refrigeration materials. The hexagonal crystal system material GdAl3 (BO3) 4 applied to the field of extremely low temperature magnetic refrigeration, provided by the invention, can show excellent magnetocaloric performance and stability under the condition of extremely low temperature (less than or equal to 300mK). According to the material, Gd < 3 + > is introduced as magnetic ions, Al < 3 + >, borate ions and other ions with small relative molecular mass are introduced as ligands, the mass ratio of the magnetic ions is guaranteed, and the material has a higher magnetic entropy change value. The phase change temperature is low, no phase change occurs at the temperature of 300 mK or above, lambda phase change occurs at the temperature of 300 mK, and the magnetic entropy is well reserved in an extremely low temperature region. Crystal water is not contained, and the structural stability and thermal stability are high. The magnetic refrigeration device has a remarkable magnetothermal effect in an extremely low temperature region, and can realize efficient, stable and convenient magnetic refrigeration application in sub-Kelvin or even lower temperature regions.

The present invention discloses a solid electrolyte material, which may include a halide-based material having a disordered crystalline structure. In one embodiment, the solid electrolyte material may include a crystalline structure containing stacking faults. In another embodiment, the solid electrolyte material may include a crystalline phase including a crystalline structure represented by a space group of the hexagonal crystal system or a space group of the rhombohedral lattice system. In another embodiment, the solid electrolyte material may include a crystalline phase including a crystalline structure represented by a monoclinic space group and a unit cell containing a reduced number of halogen atoms.