40 results about "Trigonal crystal system" patented technology

The invention discloses a series of alkali metal borate compounds and alkali metal borate crystals as well as a preparation method and application thereof, and belongs to the technical field of photoelectric functional crystal materials. The chemical general formula of the series of compounds and crystals thereof is A3RE (B3O6) 2, wherein A is K, Rb, Cs or NH4; rE = Sc and Y, the molecular weight is 355.93-744.48, the series of crystals belong to a trigonal system, the space group is P321, the cell parameters a = b = 10.5237 (13)-135237 (13), and # imgabs0 # Z = 3. The series of alkali metal borate compounds are synthesized by adopting a solid-phase reaction method or a hydrothermal method, and the series of crystals grow by adopting a high-temperature melt method or a hydrothermal method or a solution method. The series of materials can be used for manufacturing second harmonic generators, upper and lower frequency converters, optical parametric oscillators, polarizing prisms and the like.

The invention belongs to the technical field of functional materials for direct conversion of heat energy and electric energy, and particularly discloses a room-temperature thermoelectric material Bi < 0.45 > Sb < 0.55 > Te < 1 > Se < 0.05 > and a preparation method thereof, the molecular formula is Bi < 0.45 > Sb < 0.55 > Te < 1 > Se < 0.05 >, the room-temperature thermoelectric material belongs to a trigonal system, and the space group is P-3m1; on the basis of a BiTe-based material, replacement doping of Sb is carried out, and excessive doping is carried out by using Bi atoms and Se atoms, so that the room-temperature thermoelectric material Bi < 0.45 > Sb < 0.55 > Te < 1 > Se < 0.05 > and an intercalation layer with a [Bi2] layer are obtained, and due to the existence of the intercalation layer, the content of Te is reduced in the process that the material has the performance of the [Bi2Te3] layer, the content of Te is about 43% and is obviously smaller than the content (75%) of Te in Bi2Te3; the ZT value of the room-temperature thermoelectric material at room temperature can reach 0.54, and the material becomes a thermoelectric material with potential commercial value.

The invention relates to a rare earth based polyoxometallate, the chemical formula of which is [Ce (H2O) 9] [Cu (H2O) (2, 6-pdca)] 3H [SiW12O40]. 5H2O, and 2, 6-H2pdca = 2, 6-pyridinedicarboxylic acid. The compound belongs to a trigonal system and an R3 space group. Rare-earth-based polyoxometallate with peroxidase activity is combined with a copper-based metal organic framework (CuBTC) to form a rare-earth-based polyacid-loaded metal organic framework composite material with CuBTC as a carrier, and then research on the application aspect of colorimetric detection of H2O2 and ascorbic acid is carried out on the rare-earth-based polyacid-loaded metal organic framework composite material. The composite material not only expands the application range of the rare earth-based polyoxometallate-loaded metal organic framework material, but also shows the application prospect of the rare earth-based polyoxometallate-loaded metal organic framework material in clinical diagnosis and food safety monitoring, thereby providing valuable reference for further application in the future.

The invention discloses a proton solid oxide and a preparation method and application thereof, and the proton solid oxide comprises a trigonal system ABO3 type La < 0.9 > Ba < 0.1 > Co < 0.7 > Ni < 0.2 > Ag < 0.1 > O < 3-delta >, a Ruddlesden-Popper type La < 0.9 > Ba < 0.1 > Co < 0.7 > Ni < 0.2 > Ag < 0.1 > O < 3-delta > and Ag nanoparticles. The proton solid oxide provided by the invention realizes a multi-phase coexistence structure, thermogravimetric analysis shows that the proton solid oxide meets the requirements of high catalytic activity and ion / electron transfer capability, and the structure not only improves the catalytic activity of the material, but also enhances the mechanical stability and thermal expansion resistance of the material, so that the proton solid oxide can be used for preparing a composite material. And the problems of unstable catalytic activity and high-temperature structure degradation caused by additional introduction of Ni-containing substances are avoided.

The invention relates to a preparation method and a working method of a trigonal nonlinear optical crystal frequency conversion device, the frequency conversion device is provided with a first group of parallel surfaces and a second group of parallel surfaces, the first group of parallel surfaces are parallel to the c-axis and the a-axis of an optical crystal, the normal of the second group of parallel surfaces and the c-axis form an angle alpha, the included angle between the projection of the normal on the a-b plane and the axis a is beta, the relation shown in the formula 1 and the formula 2 is # imgabs0 # theta PM is the phase matching angle of incident fundamental frequency light and emergent variable frequency light of the nonlinear optical crystal, theta B = arctann and is a Brewster angle, n is the corresponding refractive index of the incident fundamental frequency light of the nonlinear optical crystal, and theta B is the corresponding refractive index of the incident fundamental frequency light of the nonlinear optical crystal. And the second group of parallel surfaces are a light-passing input surface and a light-passing output surface of the frequency conversion device. The invention provides a preparation method and a working method of a nonlinear optical crystal frequency conversion device which has a light-passing direction length as large as possible and is suitable for continuous wave application based on a flaky original crystal.

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 invention discloses a selenium phosphorus zinc halide compound, a nonlinear optical crystal thereof, and a preparation method and application of the nonlinear optical crystal. The compound does not have a symmetric center and is crystallized in a trigonal system, the space group is R3m, and the unit cell parameters of Zn0. 8P0. 2Se0. 2Br0. 6 are as follows: # imgabs0 # alpha = beta = 90 degrees, gamma = 120 degrees and Z = 3; and the unit cell parameters of the Zn0. 8P0. 2Se0. 2I0. 6 are as follows: # imgabs1 # alpha = beta = 90 degrees, gamma = 120 degrees, and Z = 3. The bromine-selenium-phosphorus-zinc and iodine-selenium-phosphorus-zinc nonlinear optical crystal has the advantages of large nonlinear optical effect, relatively large band gap value, wide infrared transmission range, good mechanical property and the like, and can be widely applied to various nonlinear optical fields and middle infrared bands.

The invention discloses a two-dimensional Van der Waals ferromagnetic quantum material with high Curie temperature and a preparation method and application thereof, the quantum material is of a two-dimensional nanosheet crystal structure and belongs to a layered Van der Waals material, and the chemical formula of the quantum material is InFeTe3; the two-dimensional InFeTe3 crystal has a hexagonal structure, and the lattice constant # imgabs0 # # imgabs1 # belongs to a trigonal system and a P3m1 space group; the method comprises the following steps: mixing In, Fe and Te elementary substances, pre-crystallizing to obtain an InFeTe metal block, and sublimating, transferring and crystallizing the metal block under vacuum sealing by adopting a double-temperature-zone tubular furnace to obtain millimeter-level InFeTe3 crystals with silver metal luster; stripping and transferring the InFeTe3 crystal, and then annealing the InFeTe3 crystal in inert gas to obtain a few-layer two-dimensional InFeTe3 crystal; the preparation method disclosed by the invention has the characteristics of simplicity, low energy consumption and high repeatability, and the two-dimensional InFeTe3 crystal prepared by the preparation method disclosed by the invention has the characteristics of high saturation magnetization and high Curie temperature, and can be applied to spin electronic devices and quantum devices.

The invention discloses a symmetric trioxane nonlinear optical crystal as well as a preparation method and application thereof. In the invention, a target crystal with a millimeter-level size is prepared by virtue of an aqueous solution cooling method, and the preparation method comprises the following steps: completely dissolving symmetric trioxane powder in water, then slowly cooling at a temperature 1-3 DEG C higher than a saturation point temperature, carrying out single crystal growth, and ending the crystal growth process when the temperature is reduced to 25 DEG C or lower, the symmetric trioxane single crystal is obtained; wherein the growth period of the crystal is 26 to 104 days. Tests show that the symmetric trioxane nonlinear optical crystal belongs to a trigonal system, the space group of the crystal is R3c, the cell parameters of the crystal are # imgabs 0 # alpha = beta = 90 degrees, gamma = 120 degrees, z = 6, the unit cell volume of the crystal is # imgabs 1 #, the ultraviolet absorption edge of the crystal can reach 155nm, and the crystal is colorless and transparent, is suitable for frequency conversion of laser output of a laser, is particularly suitable for the requirement of deep ultraviolet band laser frequency conversion, and has a wide application prospect. The material can be used for manufacturing deep ultraviolet nonlinear optical devices.

The present invention provides a Ba3Sc2(BO3)4 ultraviolet birefringent crystal, preparation and application. The Ba3Sc2(BO3)4 ultraviolet birefringent crystal has a centrosymmetric structure, belongs to the trigonal crystal system, has a space group of P-3m1, and has unit cell parameters of #imgabs0##imgabs1#α=90°, β=90°, γ=120°, Z=1, #imgabs2#. The room temperature transmission spectrum shows that the ultraviolet birefringent crystal has a wide transmission range (0.2~3.5μm), a transmittance of more than 70%, a short ultraviolet cutoff edge (198nm) and a large birefringence (Δn=0.145), and has the advantages of stable physicochemical properties, good mechanical properties, not easy to deliquesce, easy to cut, polished and stored, and is expected to be widely used in the field of ultraviolet birefringent optical materials. In the present invention, a flux method is adopted to prepare the ultraviolet birefringent crystal, which is simple to operate, the raw materials are readily available, and the preparation conditions are easy to achieve.

Provided is a vanadium carbide containing an oxygen content of 4,000 ppm or less and a carbon content of less than 15 wt %, where a crystalline system of the vanadium carbide exhibits a combination of a trigonal system and a cubic system, which facilitates the process for manufacturing MAX and MXene excluding the expensive vanadium metal.

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 discloses novel wide-band high-transmittance perfluoride complex-phase glass and a preparation method thereof. The novel wide-band high-transmittance perfluoride complex-phase glass specifically comprises the following components: 30 to 40 mol percent of AlF3, 28 to 30 mol percent of ZnF2, 11 to 27 mol percent of BaF2 + SrF2, 0 to 7 mol percent of CaF2 + MgF2 and 10 to 15 mol percent of YF3. The innovation of the invention lies in that the trigonal system AlF3 rhombohedral crystal is directionally separated out through component regulation and control, the crystal with the same component as the network former of the glass matrix is separated out in the perfluoride glass system for the first time, scattering caused by the refractive index difference between the crystal and the glass matrix is weakened, and the high-transmittance spectral range of the material is widened; and meanwhile, high spectrum flatness is realized. The wide-band high-transmittance fluoride complex-phase glass can realize full-band transmittance from 0.23 [mu] m to 7.2 [mu] m, and the transmittance is greater than or equal to 60%, wherein the transmittance of 0.86 [mu] m to 6.3 [mu] m is greater than or equal to 80%. The material is obtained through one step of melting and quenching, the preparation process is economical, simple and safe, and follow-up heat treatment is not needed.

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 present invention relates to a Li9Na3Cs2(SO4)7 compound, a nonlinear optical crystal, and the use of the Li9Na3Cs2(SO4)7 crystal for making nonlinear optical devices. The compound is prepared by a molten salt method, has a molecular weight of 1069.69, belongs to a trigonal crystal system, has a space group of P3, and has unit cell parameters of #imgabs0##imgabs1#α=90°, β=90°, γ=120°, and Z=3; it has the advantages of a short ultraviolet absorption cutoff edge of about 160nm, a moderate nonlinear optical effect, which is about 0.5 times that of the commercial nonlinear optical crystal KDP, easy preparation, stable physical and chemical properties, etc.; the crystal can be used to make nonlinear optical devices; the nonlinear optical devices made by the nonlinear optical crystal of the present invention can be used in several military and civilian high-tech fields, such as laser blinding weapons, optical disc recording, image processing, optical signal processing, and optical fiber communication.

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 present invention provides an iron-based metal-organic framework material, a preparation method thereof, and an application thereof in separating methane and propane, belonging to the technical field of gas separation. The organic ligands of the iron-based metal-organic framework material of the present invention are 5-(3-pyridyl)isophthalic acid and formic acid, and the coordination metal is Fe<supgt;3+< / supgt>. This material is a microporous material with a new topological structure, belonging to the trigonal crystal system. In its structure, every 3 Fe<supgt;3+< / supgt> are coordinated with 4 carboxylic acids from 5-(3-pyridyl)isophthalic acid, 2 formic acids, and 2 pyridine N from 5-(3-pyridyl)isophthalic acid to form a secondary structure unit with six connections. The secondary structure unit is connected with 5-(3-pyridyl)isophthalic acid to form a three-dimensional network structure with a curved pore channel having unidirectional connectivity. The iron-based metal-organic framework material of the present invention has a relatively high specific surface area and a relatively high propane adsorption capacity, and can well separate propane from methane.

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 invention provides a tuning fork type crystal oscillator, a crystal device, and an intermediate wafer. The tuning-fork-type crystal oscillator has a novel structure in which the electrodes in the support arms of the tuning-fork-type crystal oscillator having a three-arm structure can be reliably divided compared with conventional tuning-fork-type crystal oscillators. A tuning fork type crystal oscillator (10) is provided with: a base part (11); a first vibrating arm (13a) and a second vibrating arm (13b); a support arm (15); a first excitation electrode (17a) and a second excitation electrode (17b); and a first connection pad (17ax) provided on the tip side of the support arm, and a second connection pad (17bx) provided on the base side of the support arm, the first connection pad (17ax) and the second connection pad (17bx) connecting the excitation electrode to the outside. Furthermore, a first cutout (15a) parallel to a first X-axis (X1) of the crystal and a second cutout (15b) parallel to a second X-axis (X2) caused by the crystal being a trigonal system are included in a region between the first connection pad and the second connection pad of the support arm.

The present invention relates to a preparation method and an operating method of a trigonal nonlinear optical crystal frequency conversion device. The frequency conversion device has a first group of parallel surfaces and a second group of parallel surfaces. The first group of parallel surfaces is parallel to the c-axis and the a-axis of the optical crystal. The normal of the second group of parallel surfaces forms an angle α with the c-axis, and the projection of the normal on the a-b surface and the a-axis forms an angle β. The relationship θ is shown in Formula 1 and Formula 2. PM The nonlinear optical crystal satisfies the phase matching angle between the incident fundamental frequency light and the outgoing frequency-converted light, θ B =arctann, where n is the Brewster angle, and n is the refractive index of the nonlinear optical crystal corresponding to the incident fundamental frequency light. The second set of parallel surfaces constitute the light-transmitting input and output surfaces of the frequency converter. The present invention provides a method for preparing and operating a nonlinear optical crystal frequency converter device based on a thin sheet-like primary crystal, having a maximum possible light-transmitting length and suitable for continuous-wave applications.

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 nonlinear optical crystal of guanidinium tetrafluoroborate has a chemical formula of [C(NH2)3]BF4 and a molecular weight of 146.89, belongs to the trigonal crystal system, has a space group of R3m; has lattice parameters of a=7.4634(10)Å, b=7.4634(10)Å, c=9.1216(19) (6)Å, and Z=3; has an ultraviolet cutoff edge of 200 nm; and has a frequency-multiplication response that is 4-5 times that of the commercialized nonlinear optical crystal KDP. A hydrothermal method, a room-temperature solution method, an evaporation method or a solvothermal method is used to grow the crystal in a centimeter-scaled size. The crystal can produce frequency-doubling, frequency-tripling, frequency-quadrupling, frequency-quintupling or frequency-sextupling harmonic light output from the fundamental frequency light of 1064 nm generated by a Nd:YAG laser, and / or can produce ultraviolet and deep-ultraviolet frequency-multiplication light output below 200 nm.

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).