122 results about "Pyrochlore" patented technology

The invention discloses a microstructure-controllable low-thermal-conductivity double-phase high-entropy ceramic material and a preparation method thereof, and aims to solve the problems that when a pyrochlore-based ceramic material serves for a long time at a high temperature, the thermal insulation effect is insufficient, and the thermodynamic property is reduced due to grain growth. The preparation method comprises the following steps: 1, weighing raw materials according to the chemical formula of (YbxRE1yRE2yRE3yRE4y) 2B2O7; 2, adding a binder and an absolute ethyl alcohol solvent into the raw materials, and carrying out ball milling and mixing; 3, preparing a ceramic green body by adopting a dry pressing molding process; 4, performing high-temperature glue discharging treatment on the ceramic green body; and 5, carrying out solid-phase sintering on the ceramic green body after glue removal. The adopted high-entropy ceramic component comprises at least one element with the radius difference larger than that of Yb ions by 6.9%, severe lattice distortion is induced, a two-phase coexistence region of pyrochlore and fluorite is formed, the heat conductivity of the ceramic material is remarkably reduced, diffusion of the two-phase coexistence region is restrained, and the grain growth rate is reduced.

The invention discloses a high-oxygen-storage zirconium solid solution material and a preparation method, and belongs to the technical field of rare earth catalytic materials, and the method comprises the following steps: precursor preparation, ultrasonic dispersion, double-gradient precipitation, ultrasonic aging, solid-liquid separation, three-section roasting and furnace cooling. Through the synergistic effect of double-gradient precipitation and ultrasonic aging, coarse grains and non-uniform particle size distribution are avoided, and the material is not prone to abnormal growth of the grains and structural collapse in long-term high-temperature service. Meanwhile, according to the gradient roasting process, through step-by-step regulation and control of crystal densification and crystal lattice reconstruction, separation of a fluorite phase and a pyrochlore phase easily occurring in traditional low-temperature single-section roasting is reduced, a stable crystal phase structure is maintained, it is ensured that the material can still keep sufficient active surface and pore channel structures under the working conditions of high temperature and thermal shock alternation, and the performance of the material is improved. The oxygen storage capacity and the long-term durability of the catalyst carrier are obviously improved.

A method for producing a pyrochlore-type oxide including, in the composition, a plurality of cations including an alkali metal cation, the method comprising: a mixing step (S10, S20) for mixing a plurality of raw materials each containing a plurality of cations; and a heating step (S11, S21) for heating the mixture containing the plurality of raw materials at a prescribed temperature by using a liquid phase method to generate a composite oxide including, in the composition, at least an alkali metal cation and having a corundum structure.

The invention discloses a method for converting niobium minerals in niobium rough concentrate into pyrochlore. The method comprises the following steps: (1) mixing the niobium rough concentrate with a modifier, a fluorine-containing reagent, a reducing agent and a binder, and carrying out compression molding; and (2) roasting the mixed blank for a set time, preserving heat, and quenching to obtain pyrochlore type rough concentrate. The method comprises the following steps: (1) carrying out magnetic separation on pyrochlore type rough concentrate; (2) performing heating and acid leaching on the magnetic separation tailings; and (3) carrying out flotation to obtain niobium concentrate. According to the method, iron components in the rough concentrate are reduced into magnetic iron minerals, niobium minerals are converted into non-magnetic pyrochlore, follow-up niobium-iron separation is facilitated, and the grade of niobium in the niobium concentrate obtained through production can be effectively improved; and the method is high in adaptability to niobium rough concentrate, is also applicable to alkaline or acidic niobium rough concentrate, is relatively small in gangue mineral change and low in conversion reaction temperature, and has the advantages of energy conservation and emission reduction compared with other regulation and control processes.

The invention provides an extremely-low-temperature magnetic refrigeration material with a pyrochlore structure, the chemical formula of the extremely-low-temperature magnetic refrigeration material is Ce2Sn2O7, the extremely-low-temperature magnetic refrigeration material belongs to a cubic system, and the space group of the extremely-low-temperature magnetic refrigeration material is Fd-3m. Compared with a traditional magnetic refrigeration material (paramagnetic salt hydrate), the novel extremely-low-temperature magnetic refrigeration material Ce2Sn2O7 of the pyrochlore structure has good magnetocaloric performance, can achieve 100 mK-level extremely-low-temperature refrigeration in the heat insulation and demagnetization actual measurement process, and meanwhile has the advantages of being compact in structure, high in stability, large in magnetic entropy density, easy to prepare and the like.

The invention discloses a method for ultrafast synthesizing pyrochlore type and perovskite type oxides based on Joule heat, which comprises the following steps of: firstly, obtaining a solid precursor by adopting a coprecipitation method, then quickly heating the solid precursor to 700-800 DEG C by using a Joule heat shock technology, cooling to room temperature, and circulating heating-cooling operation for a plurality of times to prepare a series of pyrochlore type (A2B2O7) and perovskite type (ABO3) oxides; the synthesis time is extremely short (lt; the method has the advantages of high yield (more than 2500g / h), high energy efficiency and potential to realize the purpose of high-flux synthesis, and has a good industrial production basis and a wide application prospect.

The invention discloses a pyrochlore structure high-entropy ceramic solidified body material as well as a preparation method and application thereof, and belongs to the technical field of nuclear waste solidification. The preparation method of the high-entropy ceramic solidified body material with the pyrochlore structure comprises the following steps: weighing raw material powder of La2O3, Nd2O3, Sm2O3, Gd2O3, Eu2O3 and ZrO2 according to the proportion in (La0. 2Nd0. 2Sm0. 2Gd0. 2Eu0. 2) 2Zr2O7; the weighed raw material powder is subjected to ball milling treatment, and ball-milled powder is obtained; under the inert gas atmosphere, the ball-milled powder is subjected to heat treatment, and heat-treated powder is obtained; and carrying out spark plasma sintering on the heat treatment powder to obtain the pyrochlore structure high-entropy ceramic solidified body material. The powder is treated by using a heat treatment technology, so that the powder is homogenized, a pyrochlore phase is formed, grain growth is more favorably inhibited, a fine grain structure is obtained, and the irradiation stability and the mechanical property of the pyrochlore material are improved.

The invention relates to the technical field of special ceramic products, in particular to ceramic capable of naturally forming cracks and a preparation method thereof, and solves the defects in the prior art. The ceramic comprises the following components: a matrix phase: aluminum oxide and tetragonal phase zirconium oxide; the biological template derivative phase is a carbonized bamboo fiber residual carbon network, the surface of the carbonized bamboo fiber residual carbon network is coated with a beta-silicon carbide quantum dot layer, and the residual carbon network is distributed in a radial density gradient manner; a reinforcing phase: beta-sialon whiskers; and the surface functional layer is an yttrium oxide stabilized yttrium aluminum garnet pinning phase and a pyrochlore type lanthanum zirconium oxide nano porous layer. According to the method, through accurate mapping of material components and process parameters (centrifugal force gradient, water vapor partial pressure and asymmetric cooling), synchronous optimization of crack morphology and mechanical properties is achieved, the mindset of'crack inhibition 'of traditional ceramics is broken through, and a new paradigm of'active crack design' is created.

The invention discloses fluorite-pyrochlore double-phase high-entropy oxide ceramic powder and a preparation method thereof, and relates to the technical field of high-performance ceramics. The preparation method comprises the following steps: (1) weighing ZrO2 powder, HfO2 powder, Pr6O11 powder, La2O3 powder and Sm2O3 powder with equal atomic percent, putting the ZrO2 powder, the HfO2 powder, the Pr6O11 powder, the La2O3 powder and the Sm2O3 powder into a crucible, and calcining in a muffle furnace to remove moisture and impurities; (2) carrying out ball-milling mixing on the calcined ZrO2 powder, HfO2 powder, Pr6O11 powder, La2O3 powder and Sm2O3 powder, and drying and grinding in a drying box after ball-milling to obtain high-entropy ceramic oxide precursor powder; and (3) putting the high-entropy ceramic oxide precursor powder into a muffle furnace, carrying out heat treatment in an air atmosphere, and cooling and grinding to obtain the high-entropy oxide ceramic powder with the fluorite-pyrochlore dual-phase structure. The chemical formula of the prepared double-phase high-entropy ceramic powder material is (Zr, Hf, Pr, La, Sm) O < 2-delta >, and the double-phase high-entropy ceramic powder material is of a fluorite-pyrochlore double-phase structure, and has low heat conductivity, high thermal expansion coefficient and good heat-conducting property.

The invention discloses a magnesium oxide-medium / high-entropy zirconate pyrochlore multiphase ceramic inert fuel base material and a one-step preparation method, the magnesium oxide-medium / high-entropy zirconate pyrochlore multiphase ceramic inert fuel base material has a chemical general formula of omega MgO-(1-omega) (A1 / n) 2Zr2O7, omega represents 30-80wt.%, (1-omega) (A1 / n) 2Zr2O7, (1-omega) (A1 / n) 2Zr2O7, (1-omega) (A1 / n) 2Zr2O7, (1-omega) (A1 / n) 2Zr2O7, (1-omega) (A1 / n) 2Zr2O7, (1-omega) (1 N represents the number of element types of A lattice sites in (A1 / n) 2Zr2O7 pyrochlore, and n is an integer and is greater than or equal to 3 and less than or equal to 5; meanwhile, the types of the elements are selected from La, Nd, Sm, Y and Er, and the types of the elements and the mass ratio of the two crystal phases in the composite ceramic can be regulated and controlled at will. The composition design and one-step preparation method of the MgO-medium / high-entropy (A1 / n) 2Zr2O7 composite ceramic inert fuel base material, provided by the invention, have the advantages of flexible composition design, simple preparation process flow, high product compactness, suitability for simultaneous transmutation treatment of Pu and various MA and the like.

The invention provides rare earth zirconate-based complex-phase high-entropy ceramic as well as a preparation method and application thereof, and belongs to the technical field of ceramic materials. The rare earth zirconate-based complex-phase high-entropy ceramic disclosed by the invention comprises a rare earth zirconate high-entropy matrix (La < 0.2 > Gd < 0.2 > Y < 0.2 > Y 0.2 < Er < 0.2 >) 2 (Zr < 0.5 > Ti < 0.5 >) 2O7 with a pyrochlore structure and a second-phase rare earth manganate high-entropy material (La < 0.2 > Gd < 0.2 > Y < 0.2 > Y 0.2 < Er < 0.2 >) MnO3 with a perovskite structure. The rare earth zirconate-based complex-phase (pyrochlore-perovskite) high-entropy ceramic for shielding thermal radiation is prepared by taking high-entropy rare earth zirconate with a pyrochlore structure as a matrix and taking a rare earth manganate high-entropy material with a perovskite structure as a second phase (dopant). The prepared complex-phase high-entropy ceramic can effectively improve the thermal radiation shielding performance and hinder the radiation heat conduction at high temperature, thereby inhibiting the rapid increase of the thermal conductivity at high temperature.

The invention discloses a neodymium, gadolinium and erbium doped composite ceramic solidified body and a preparation method thereof, and belongs to the field of non-metallic materials. The ceramic solidified body is of a two-phase structure, and the two phases are pyrochlore and monazite; the composite ceramic solidified body comprises GdPO4, Er2Ti2O7 and NdErTi2O7, and the leaching rate of the composite ceramic solidified body is 10 <-7 > g.m <-2 >. D <-1 >. The preparation method of the solidified body comprises the following steps: by taking Zn2TiO4, CaHPO4, SiO2 and B2O3 as solidified body matrixes, adding lanthanide oxides Nd2O3, Gd2O3 and Er2O3, mixing, uniformly grinding, carrying out high-temperature solid-phase reaction on the obtained mixed powder, and naturally cooling to room temperature after the reaction is finished, so as to obtain the monazite phase and pyrochlore phase ceramic solidified body. The ternary multiphase ceramic solidified body has good mechanical performance and leaching resistance, the leaching rate of lanthanide series elements is in the order of magnitude of 10 <-7 > g.m <-2 >. D <-1 >, and the ternary multiphase ceramic solidified body has an excellent solidification effect and has reference significance for deep geological storage of high-level waste.

A multilayer ceramic electronic device includes an element body 10 including a multilayer portion in which a plurality of dielectric layers 11 and a plurality of internal electrode layers 12 are stacked, wherein at least one of the plurality of dielectric layers 11 includes a pyrochlore phase 50.

The invention discloses a series of high-stability negative temperature coefficient heat-sensitive materials based on seven-principal-element high-entropy rare earth stannate and application, and aims to solve the problem that existing stannate heat-sensitive materials with pyrochlore structures cannot meet long-term application in high-temperature environments. The series of heat-sensitive materials are prepared by mixing lanthanum trioxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide and tin dioxide with erbium oxide or ytterbium oxide respectively, and the preparation process comprises the steps of wet three-dimensional vibration ball milling, powder calcination, cold isostatic pressing, high-temperature sintering and the like. And finally obtaining the negative temperature coefficient heat-sensitive material with the pyrochlore structure. The electrical property parameters of the series of materials are as follows: B is equal to 13914-14067 + / -1.89% K, and rho 1500 DEG C is equal to 180.26-204.09 + / -1.38% omega.cm. The negative temperature coefficient heat-sensitive material has the negative temperature coefficient characteristic in the wide temperature range of 400-1500 DEG C and shows excellent high-temperature aging stability under the high-temperature condition of 1500 DEG C, and the resistance drift rate of the negative temperature coefficient heat-sensitive material is only 0.7% after an aging test for 500 hours.

The present disclosure provides a ceramic material for a thermal barrier coating and a manufacturing method thereof. A chemical composition of the ceramic material is LaYbZrCeO7. The ceramic material is manufactured by doping LaO1.5, YbO1.5 and CeO2 into ZrO2. A mole ratio of LaO1.5, YbO1.5, CeO2 and ZrO2 is 1:1:1:1. The manufactured ceramic material is in a composite phase structure mainly including a pyrochlore phase and a fluorite phase. The ceramic material according to the present disclosure can effectively inhibit corrosion penetration of molten CMAS in a high temperature environment, which reduces or avoids ceramic cracking and peeling. This better maintains microstructural integrity of the ceramic surface, thereby extending service life of ceramics.

[Problem] To provide a bismuth-ruthenium-oxygen type pyrochlore oxide powder in which the particle size distribution is controlled so as to be advantageous for improving dispersibility in a liquid medium and the intermingling of impurity phases is remarkably reduced. [Solution] A pyrochlore oxide powder that is a powder that has a crystal structure of a bismuth-ruthenium-oxygen type pyrochlore oxide and is composed of particles containing bismuth and ruthenium or containing bismuth, ruthenium, and manganese as metal elements, wherein the cumulative 50% particle diameter D50 in a volume-based particle size distribution determined using a laser diffraction scattering method is 3.0 μm or smaller, and a bismuth-containing phase different from the crystal structure of the pyrochlore oxide is not detected in an X-ray diffraction pattern.

The invention discloses a nuclear waste containing material and a preparation method and application thereof, and belongs to the technical field of nuclear waste treatment.The nuclear waste containing material is characterized in that site-specific doping of trivalent or tetravalent nuclides is achieved through trivalent or tetravalent nuclides, namely, A-site doping is conducted on Lu4Hf3O12 through Z < 3 + > or B-site doping is conducted on Lu4Hf3O12 through Z < 4 + >, the solid solubility of the A-site Z < 3 + > is as high as 25 mol%, and the solid solubility of the B-site Z < 4 + > is as high as 40 mol%; compared with a traditional pyrochlore-based material, the nuclide containing capacity is remarkably improved, the relative density of the nuclear waste containing material is larger than or equal to 95%, and the grain size can reach 1-5 microns; the prepared nuclear waste containing material is excellent in leaching resistance, and the leaching rate of the nuclear waste containing material is 2-4 orders of magnitude lower than that of a conventional curing material; the nuclear waste containing material prepared by the invention has better long-term chemical stability, and the mass loss rate of a highly-doped sample after long-term leaching is reduced by 21% compared with that of a low-doped sample.

The present invention discloses a low-temperature rare earth pyrochlore-type microwave dielectric ceramic material and a preparation method thereof. The molecular formula of the ceramic material is La2Ce (2‑5x / 4) V x O7, where 0.02 ≤ x ≤ 0.08. The preparation method includes the following steps: Step S1, weighing CeO2, La2O3, and V2O5 in proportion and ball-milling and mixing them; Step S2, drying the product obtained in Step S1, calcining it, keeping it warm, and cooling it with the furnace; Step S3, weighing LiF and MgF2, where the mass of LiF is 0.5-1.0 wt% of the mass of the product obtained in Step S2, and the mass of MgF2 is 0.75-1.5 wt% of the mass of the product obtained in Step S2, and grinding and mixing them; Step S4, performing secondary ball-milling on the product obtained in Step S2 and the product obtained in Step S3, and drying; Step S5, preparing a blank from the powder obtained in Step S4 and sintering it. The present invention improves Q × f value and significantly reduces the sintering temperature at the same time.

This oxygen occlusion material: has a chemical composition represented by Ce1-xZrxO2-δ (0.45≤x≤0.65, 0≤δ); in the XRD pattern, has, in the vicinity of 14.5°, a peak attributed to a cubic pyrochlore li

The invention relates to an application of ruthenium-based pyrochlore in hydrogen production of an alkaline anion exchange membrane electrolytic bath, which comprises the following steps: providing ruthenium-based pyrochlore Pb2M2-xRuxO7, in which M is Fe, Co, Ni, Cu or Zn, 0 lt; xlt; 2; ruthenium-based pyrochlore and the first mixed solution are mixed and then subjected to ball milling, and first slurry is obtained; removing the first mixed solution in the first slurry to obtain ball-milled ruthenium-based pyrochlore; mixing and dissolving the ball-milled ruthenium-based pyrochlore and carbon powder in a second mixed solution, and adding a dispersing agent for barreling to obtain second slurry; and ultrasonically spraying the second slurry on an anion exchange membrane to serve as an oxygen evolution anode. According to the invention, the ruthenium-based pyrochlore Pb2Ru2O7 is subjected to B-site 3d transition metal doping, so that not only is the use amount of noble metal Ru reduced and the cost of the catalyst reduced, but also the reaction energy barrier of electrolyzed water is jointly reduced under the synergistic effect of Ru and 3d transition metal, and the oxygen evolution activity is further improved.

The invention relates to the technical field of thermal barrier coating materials, in particular to an unequal-ratio Ce doped pyrochlore and fluorite double-phase high-entropy rare earth zirconate thermal barrier coating material and a preparation method thereof. The chemical composition formula of the thermal barrier coating material provided by the invention is (La < 0.2 > Ce < 0.1 > Sm < 0.1 > Dy < 0.2 > Yb < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >, (La < 0.2 > Sm < 0.2 > Yb < 0.2 > Sc < 0.2 > Y < 0.1 > Ce < 0.1 >) < 2 > Zr < 2 > O < 7 >, and (La < 0.2 > Ce < 0.1 > Nd < 0.1 > Yb < 0.2 > Lu < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >. The thermal expansion performance of the prepared coating material is obviously improved under the conditions that the low thermal conductivity, the high mechanical property and the high sintering resistance are met at the same time, and therefore the high-entropy rare earth zirconate thermal barrier coating material of the Ce-containing double-phase structure is promoted, and it is guaranteed that the material is practically applied to the field of thermal barrier coating materials.

Provided are a composite oxide powder from which dense solid electrolyte objects having a high ion conductivity can be produced and a method for producing the composite oxide powder. The composite oxide powder is composed of particles comprising lithium (Li), lanthanum (La), zirconium (Zr), and oxygen (O) and having a cubic garnet-type crystal structure, and has a volume particle size distribution in which the 50% diameter (D50) is 1,000 nm or smaller, the composite oxide powder having a pyrochlore phase content of 10 mass % or less.

Core-shell support, comprising: a core comprising at least one oxygen storage / release material selected from alumina-doped ceria-zirconia-based solid solutions; and a shell comprising a rare earth zirconium oxide-based composite oxide represented by a composition formula: (R 1-x Ce x )2Zr2O 7+x , where R represents a rare earth element which is at least one element selected from the group consisting of La, Nd, Pr, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc and Y, and x represents a number from 0.0 to 0.8, and with which an outer side of the core is coated, wherein the rare earth zirconium oxide-based composite oxide contains crystal particles having a pyrochlore structure, and the composite oxide based on rare earth zirconium oxide has an average crystal diameter of 3 to 9 nm, wherein an amount of the rare earth zirconium oxide-based composite oxide forming the shell is 4 to 24 parts by mass based on 100 parts by mass of the at least one oxygen storage / release material forming the core.

A method for producing a pyrochlore-type oxide containing a plurality of cations including alkali metal cations in the components, the method comprising: a mixing step (S10, S20) in which a plurality of raw materials each containing a plurality of cations are mixed; and a heating step (S11, S21) in which a mixture containing a plurality of raw materials is heated by a liquid phase method at a predetermined temperature, thereby producing a composite oxide having a corundum structure, the composition of which contains at least an alkali metal cation.

The present invention discloses a Mg / Ba dual-doped catalyst for the catalytic combustion of methane, its preparation method, and application. The catalyst uses La2Ce2O7 as a carrier and Mg and Ba oxides as active components. The carrier and active components are combined using a hydrothermal method, and the catalyst is then uniformly loaded using a colloidal crystal template method. This pyrochlore-type compound (A2B2O7) has high thermal stability, meeting the requirements of a methane oxidative coupling (OCM) catalyst. The catalyst is highly selective, exhibits high catalytic activity in the OCM reaction at low temperatures (<650°C), exhibits high methane removal rates, and produces high yields of C2 products (C2H4 and C2H6), promising broad market applications.

The invention discloses a gas-phase surface modification method of pyrochlore oxide and application thereof, the gas-phase surface modification method comprises the following steps: adopting a pyrolysis gas-phase product of dicyandiamide to carry out gas-phase surface modification treatment on the pyrochlore oxide to obtain the surface-modified pyrochlore oxide. According to the method, surface reconstruction and subsurface heterogeneous interface construction of the pyrochlore oxide can be synchronously realized by utilizing a gas-phase product generated by pyrolysis of dicyandiamide and nitrogen-containing substances such as NH3 and CN <-> contained in the gas-phase product to dominate a reducing atmosphere, and after gas-phase surface treatment, the crystal surface of the pyrochlore oxide generates tensile strain, a large amount of lattice distortion is generated, and the surface of the pyrochlore oxide is subjected to surface modification. The electron energy level of the outer layer of the pyrochlore oxide material is changed due to the change of the distance between lattice atoms, the electrochemical reaction activity of the pyrochlore oxide material is remarkably improved, and the obtained surface-modified pyrochlore oxide has wide application as a catalyst, especially a catalyst for producing hydrogen by electrolyzing water.

The invention provides a complex-phase high-voltage energy storage dielectric film, a capacitor and a preparation method of the complex-phase high-voltage energy storage dielectric film, the chemical formula of the complex-phase high-voltage energy storage dielectric film material is Bi (4-x) AxTi (3-x) BxO12, A is a + 3-valent rare earth element ion, B is a + 4-valent ion, x represents the doping amount of the A ion or the B ion, x is equal to 0.5-1, and the complex-phase high-voltage energy storage dielectric film material has a part of pyrochlore phase. By forming part of the pyrochlore phase with higher dielectric constant, the energy storage density of the film material and the compression strength of the film material are improved; by accurately controlling the sintering temperature and the material composition, the dielectric loss of the thin film material is effectively reduced, and the energy conversion efficiency is improved; the P-E linetype of the thin film material is optimized, the polarization response is more uniform and stable, and the working stability and reliability of the complex-phase high-voltage energy storage dielectric capacitor can be improved; the preparation process is simple, the production cost can be reduced, the production efficiency can be improved, and the process of converting a new material from a laboratory to the market can be accelerated.

The invention belongs to the technical field of high-entropy materials, and discloses a Cr2O3 coated high-entropy pyrochlore composite ceramic as well as a preparation method and application thereof, the composite ceramic is xCr2O3. (1-x) (La0. 2Nd0. 2Sm0. 2Gd0. 2Sc0. 2) 2Zr2O7, x is 5-20wt.%, Sb0. 2Sb0. 2Gd0. 2Sc0. 2) 2Zr2O7, Sb0. 2Sb0. 2Gd0. The preparation method comprises the following steps: sintering lanthanum oxide, neodymium oxide, samarium oxide, gadolinium oxide and zirconium oxide at 1400-1700 DEG C to obtain high-entropy pyrochlore powder, adding the high-entropy pyrochlore powder into a CrCl3 solution after ball milling, stirring, drying to obtain CrCl3 coated high-entropy pyrochlore powder, pressing the CrCl3 coated high-entropy pyrochlore powder into blocks, carrying out cold sintering at 200-400 DEG C and 200-500 MPa, carrying out heat preservation at 800-900 DEG C, heating to 1500-1700 DEG C, and carrying out pressureless sintering. The composite ceramic is high in density, excellent in radiation resistance and leaching resistance and capable of being applied to the field of nuclear waste solidified bodies.

The present application relates to the field of new materials, and aims to provide a preparation method of high-entropy pyrochlore type catalytic material with diatom shell morphology.The method comprises the following steps: immersing diatomite in a mixed solvent of triethanolamine and alcohol, adding a plurality of metal precursor solutions and L-lysine and ascorbic acid, uniformly mixing, then adding hydrogen peroxide and NaOH in sequence;after hydrothermal reaction, adding gluconic acid, and performing hydrothermal reaction again;burning the solid product to obtain the catalytic material.The present application adjusts the metal ion complexes in the precursor solution to make the dissociation degrees of the metal ions similar, so that the metal ions with large electronegativity difference have good cooperativity in the subsequent nucleation and crystallization process, thereby improving the uniformity of the final product and reducing the formation temperature of the pyrochlore phase;the formation temperature of the pyrochlore is reduced through secondary hydrothermal reconstruction crystallization;therefore, the present application can save the production cost of the catalytic material compared with the prior art.

A solid electrolyte for a secondary battery comprises a core phase (101) with a particle shape and a shell phase (102) that covers at least part of the core phase. The shell phase consists of one or more phases. A material component of the core phase includes a pyrochlorine solid electrolyte, which is described by the composition formula Aa 2α Away (1+α) / 3 B2O 7-β X β is shown, where Aa is an alkali metal, Ab is a lanthanide, B is a cationic metal, and X is an anion that can be substituted by O. One material component of the shell phase includes a material with a chemical composition that differs from that of the pyrochlore solid electrolyte and with a melting point that is lower than that of the pyrochlore solid electrolyte.