117 results about "Gadolinium oxide" patented technology

The invention provides a nano protective fiber and a preparation method therefor and the use thereof, and a protective product thereof. The nano protective fiber comprises a core layer and a shell layer, wherein the core layer is fibrous, and the shell layer is coaxially coated on the core layer; the core layer comprises a first polymer and a neutron absorber filled in the first polymer, and the shell layer comprises a second polymer and a γ-ray shielding agent filled in the second polymer; and the neutron absorber comprises nano gadolinium oxide powder. Nano protective fiber having such a structure can achieve a good protective effect on both neutrons and γ-rays, and a protective product prepared therefrom is very comfortable to wear.

The present application relates to the technical field of target materials, and specifically discloses a tin oxide-based target material, a preparation method therefor, and a use thereof. Raw materials for the preparation of the tin oxide-based target material of the present application comprise, in parts by mass, 91-95 parts of tin oxide, 1.5-3.5 parts of tantalum oxide, 1.5-3.5 parts of zinc oxide, 0.5-2 parts of tungsten oxide, and 0.3-1.5 parts of gadolinium oxide, and further comprise a binder and a plasticizer. The present application further provides a preparation method for the tin oxide-based target material and a use of the tin oxide-based target material. The tin oxide-based target material provided by the present application has high density and extremely low resistivity, wherein the density of the tin oxide-based target material is greater than or equal to 6.5 g / m3, and the resistivity thereof is smaller than or equal to 1×10-2Ω·cm. Therefore, the tin oxide-based target material can be suitable for direct-current (DC) magnetron sputtering coating. In addition, due to the advantages of good light transmittance and low resistivity, the tin oxide-based target material of the present application can further improve battery conversion efficiency and can be applied to photovoltaic heterojunction batteries and perovskite batteries.

The invention belongs to the technical field of high-entropy materials, and discloses high-entropy pyrochlore ceramic as well as a preparation method and application thereof. The chemical formula of the high-entropy pyrochlore ceramic is (La0. 2Nd0. 2Sm0. 2Gd0. 2Er0. 2) 2M2O7, M is Zr, Hf, Ti or Sn, lanthanum oxide, neodymium oxide, samarium oxide, gadolinium oxide, erbium oxide and zirconium oxide or hafnium oxide or titanium oxide or tin oxide are sintered at the temperature of 1400-1600 DEG C to synthesize high-entropy pyrochlore powder, the high-entropy pyrochlore powder is mixed with tin chloride, ball-milled and dried to obtain mixed powder, the mixed powder is mixed with a surfactant, the mixed powder is mixed at the temperature of 200-400 DEG C, ball-milled and dried, and the high-entropy pyrochlore ceramic is obtained. And carrying out cold sintering under the pressure of 200-500MPa, and then carrying out vacuum sintering at the temperature of 1300-1600 DEG C, thereby obtaining the The high-entropy pyrochlore ceramic disclosed by the invention is high in purity, high in density, excellent in mechanical property and leaching resistance, low in sintering temperature and short in heat preservation time, and has an application prospect in the field of nuclear waste curing.

The invention relates to the technical field of thermal barrier coatings, in particular to a gadolinium oxide and aluminum oxide co-doped modified YSZ: Dy thermal barrier sensing coating material as well as a preparation method and application thereof. The invention provides a thermal barrier sensing coating material. The chemical composition of the thermal barrier sensing coating material is Y Gd Al < c > Zr < d > DeyOf, wherein a is equal to 0.01 to 0.04, b is equal to 0.15 to 0.35, c is equal to 0.40 to 0.60, d is equal to 0.35 to 0.70, e is equal to 0.01 to 0.02, and f is equal to 1.50 to 1.70. The temperature measurement upper limit of the thermal barrier sensing coating material is 1200 DEG C, and the average thermal expansion coefficient is increased by 18% at the room temperature of 1200 DEG C, so that the thermal shock resistance of the thermal barrier sensing coating is effectively improved, and the service life of the thermal barrier sensing coating is prolonged.

The invention discloses a friction material, a brake pad and a preparation method of the brake pad. Comprising the following raw materials: 14-18 parts of modified phenolic resin, 10-15 parts of modified composite fiber, 4-7 parts of aramid fiber, 3-5 parts of rubber powder, 5-8 parts of steel fiber, 7-11 parts of graphite, 3-6 parts of aluminum oxide, 3-5 parts of silicon carbide, 4-6 parts of mica powder, 9-13 parts of potassium titanate whisker and 8-11 parts of barium sulfate. The modified composite fiber is prepared by the following steps: mixing basalt fiber and carbon fiber, coating lanthanum gadolinium oxide on the surface through hydrothermal reaction, modifying with silane, and finally reacting with 4, 5-diamino-2, 6-dimercaptopyrimidine. The friction material has the advantages of good mechanical properties, low wear rate, high thermal stability and stable friction coefficient, and is suitable for automobile brake pads.

A method for controlling reactivity in a nuclear reactor is provided. The method comprises circulating coolant through the nuclear reactor. A composition of the coolant comprises water and gadolinium. The gadolinium is present in the coolant at a concentration suitable for controlling a neutronic reactivity of the nuclear reactor. A method for adjusting reactivity in a nuclear reactor and a coolant composition for a nuclear reactor are also provided.

The invention discloses a high-mechanical-property aluminum-based composite material for shielding neutrons and gamma rays and a preparation method of the high-mechanical-property aluminum-based composite material for shielding the neutrons and the gamma rays, 6-series aluminum alloy is used as basic alloy, and tungsten boride with the volume fraction being 9-20% or mixed powder of tungsten and boron with the volume fraction sum being 9-20% is added, so that the high-mechanical-property aluminum-based composite material for shielding the neutrons and the gamma rays is obtained. The preparation method comprises the following steps: weighing raw material powder, putting the weighed raw material powder into a stainless steel tank, adding a ball milling medium and a lubricant, putting the obtained raw materials into the stainless steel tank, putting the stainless steel tank on a ball mill, carrying out vacuum ball milling to obtain a mixture, putting the mixture into a graphite mold, and carrying out hot pressing to obtain the high-strength graphite material. And heating and pressurizing in a vacuum environment or a protective atmosphere, carrying out hot pressed sintering under the conditions of heat preservation and pressure preservation, and cooling to room temperature to obtain the compact sintered block of the tungsten-boron-gadolinium-aluminum composite material. The tungsten-boron-gadolinium-aluminum composite material can achieve good neutron and gamma ray shielding at the same time, and has high application value.

A composite electromagnetic wave-absorbing material and preparation method therefor are provided. The composite electromagnetic wave-absorbing material includes following raw materials: magnetite powder, nickel powder, copper powder, samarium oxide, gadolinium oxide, cerium oxide, carbon black powder, graphite powder, epoxy resin, barium titanate powder, antioxidant, curing agent, diluent and leveling agent. Ferrite wave-absorbing materials are used as matrixes to be compounded with nickel powder, copper powder, graphite powder, carbon black and barium titanate, and doped with mixed rare earth oxides through combination of samarium oxide, gadolinium oxide and cerium oxide to thereby obtain the composite electromagnetic wave-absorbing material which combines magnetic loss characteristics of magnetite powder, ferromagnetic behavior of nickel powder and conductivity of copper powder, helping to achieve good electromagnetic wave-absorbing performance. By introducing graphite powder, carbon black powder and barium titanate powder as fillers and doping rare earth, wave-absorbing characteristics of the composite electromagnetic wave-absorbing material are improved.

This invention discloses a composite rare earth oxide co-stabilized zirconia ceramic microsphere and its preparation method, belonging to the technical field of zirconia ceramic microspheres. The zirconia ceramic microspheres are prepared from 80-90 parts by mass of tetragonal zirconia (ZrO2) powder, 0.5-1 parts by mass of alumina (Al2O3) powder, 5-10 parts by mass of yttrium oxide (Y2O3) powder, and 5-10 parts by mass of composite rare earth oxide powder. This invention uses tetragonal zirconia as the base material, adds yttrium oxide (Y2O3) as a stabilizer, and further adds composite rare earth oxides ytterbium oxide (Yb2O3) and nano-gadolinium oxide (Gd2O3). Yb2O3 serves as the second stabilizer, while Gd2O3 enhances the ferroelastic toughening effect of the ceramic. The combined effect of the two rare earth oxides increases the strength of the zirconia ceramic microspheres.

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 invention discloses a RuIr-Gd2O3 bimetallic catalyst, a preparation method thereof and application of the RuIr-Gd2O3 bimetallic catalyst in a reaction for preparing synthesis gas by catalyzing N2O methane oxide dry reforming. The RuIr-Gd2O3 bimetallic catalyst is prepared from a Gd2O3 carrier and a RuIr bimetallic nano-alloy loaded on the Gd2O3 carrier, and the RuIr-Gd2O3 bimetallic catalyst is prepared from the RuIr-Gd2O3 bimetallic nano-alloy. The preparation method comprises the following steps: mixing the Gd2O3 carrier with a solution containing a Ru precursor and an Ir precursor, carrying out a stirring reaction under ultraviolet irradiation, evaporating the solvent to dryness, drying, and roasting in a reducing atmosphere to obtain the RuIr-Gd2O3 bimetallic catalyst. According to the method, efficient activation of N2O, precise cracking of CH4 and selective oxidation of an intermediate are realized through oxygen species slow release, redox center separation and bimetal site coordination strategies, so that the catalyst has high conversion rate and high CO / H2 yield at low temperature, and shows huge potential of cooperatively utilizing greenhouse gases under mild conditions.

The invention relates to a preparation method and application of a universal graphene-loaded lanthanide oxysulfide catalytic material, the method adopts graphene oxide as a substrate to load a gadolinium hydroxide precursor, and combines a universal synthesis strategy that elemental sulfur is calcined at a high temperature in an inert atmosphere to successfully prepare a GO-loaded Ln2O2S / GO catalytic material with uniformly distributed Ln2O2S nanoparticles. The lanthanide oxysulfide obviously increases the surface polarity of the material, the polysulfide (LiPSs) is effectively anchored through double-site chemical adsorption, meanwhile, a multifunctional catalytic interface of an oxygen-sulfur double active center is constructed, and the liquid phase conversion kinetics of the LiPSs is accelerated. The introduction of the sulfur element synchronously reduces the energy band gap of the material, promotes the rapid migration of charges, and meets the requirement of efficient charge transfer under the condition of high sulfur loading. According to the collaborative design strategy, efficient catalytic conversion and charge transfer enhancement of LiPSs are synchronously realized, the shuttle effect is inhibited from double dimensions of dynamics and thermodynamics, and an innovative solution is provided for performance optimization of the lithium-sulfur battery.

The invention discloses a tubular composite electrode for lunar soil fused salt electrolysis oxygen production, a preparation method and application, and belongs to the technical field of in-situ utilization of lunar soil resources of the moon. The tubular composite electrode for lunar soil molten salt electrolysis oxygen production is of a multi-layer nested tubular structure and sequentially comprises a porous anode layer, a compact electrolyte layer and a porous cathode layer from inside to outside, the compact electrolyte layer is made of yttria-stabilized zirconia; the porous anode layer is made of metal iridium, platinum or a mixture of metal iridium and yttria-stabilized zirconia; the porous cathode layer is made of a mixture of metal molybdenum and gadolinium oxide doped cerium oxide; according to the composite electrode structure, through the compact solid oxide electrolyte, generated oxygen is concentrated in the middle hollow structure, metal oxidation caused by anode oxygen at the middle hollow structure is avoided, and the electrolytic efficiency can be improved.

The present invention developed a composite having a novel structure containing, in a high content, a powder having a radiation-shielding function.　Provided is a composite having a radiation-shielding function and a method for producing the same. The composite comprises a preform made from a mixture containing a liquid silica-based binder and one or more radiation-shielding powders selected from gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder, and ferrite powder, the radiation-shielding powder(s) being contained in the range from 3% to 85% in total. All of the voids in the preform are impregnated and filled with molten aluminum and solidification is allowed to occur to form a composite, or 25% or more of the voids in the preform are impregnated with a liquid organic / inorganic sealing agent and solidification is allowed to occur to form a composite. The liquid silica-based binder has properties that allow the preform to be formed at a temperature at which the radiation-shielding powder(s) does not decompose.

The present invention discloses a nanometer dual-phase high-entropy zirconate material with nearly equal proportions, and a preparation method and application thereof, belonging to the technical field of thermal barrier coating materials. The present invention obtains five single rare earth metal salt solutions by dissolving lanthanum oxide, neodymium oxide, gadolinium oxide, dysprosium oxide and ytterbium oxide in acid solution respectively; the five single rare earth metal salt solutions are sequentially added to the zirconium salt solution in the order of ion radius from large to small to form a mixed solution with a uniform and stable tetramer structure, and then a precipitant is added to carry out precipitation reaction to obtain a gel-like precursor precipitate; the gel-like precursor precipitate is subjected to aging, ball milling and high-temperature calcination to obtain a high-entropy zirconate material. The zirconate material of the present invention exhibits extremely low thermal conductivity, extremely high thermal expansion coefficient, good mechanical properties and high-temperature stability through the synergistic effect of alloy components and nearly equal dual phases.

The invention relates to the technical field of polymer composite materials, and particularly discloses a nylon composite material with a gamma ray shielding effect and a preparation method of the nylon composite material. The nylon composite material with the gamma ray shielding effect comprises the following components in parts by weight: 70-100 parts of nylon; 15-30 parts of a radiation shielding filler; 0.5 to 1 part of an antioxidant; 0.5 to 1 part of a lubricant; the preparation raw material of the radiation shielding filler is selected from one or a mixture of more than one of gadolinium oxide, cerium oxide, lanthanum oxide, tungsten oxide and bismuth oxide. Researches show that the radiation shielding filler is added into the nylon, so that the prepared nylon composite material has a relatively good gamma ray shielding effect; the important application value is realized.

A fuel design for high burnup in water-cooled reactors is disclosed. A nuclear fuel rod comprising an outer zone of annular fuel pellets composed of actinides and fissile material and an interior comprising a low density, high open porosity ceramic foam of zirconia or magnesia is used. Use of annular pellets lowers fuel temperature, reduces fission gas release and fuel swelling. Foam with low crushing strength is used to accommodate fuel swelling. Fresh fuel reactivity is controlled by burnable absorbers such as gadolinia, incorporated as sintered bodies within the foam or as part of the fuel composition or both. The placement of burnable absorber in the foam reduces the contact area with surrounding media, mitigating diffusional transport and preserving its self-shielding characteristic. A novel two-piece foam holder is proposed to insert the ceramic foam.

The invention provides a neodymium-iron-boron magnet, a preparation method thereof, a high-radiation-resistance bonded neodymium-iron-boron magnet and application. The neodymium-iron-boron magnet is of a core-shell structure. The core-shell structure comprises an inner core, an inner shielding layer and an outer protection layer, wherein the inner shielding layer and the outer protection layer sequentially cover the surface of the inner core. Wherein the inner core comprises a neodymium iron boron magnetic material, the inner shielding layer comprises gadolinium oxide, and the outer protection layer comprises boride. According to the method, efficient cascade shielding of high-energy particles such as neutrons and gamma rays is formed through the nuclear physical shielding principle (the neutron capture effect of the gadolinium element and the gamma ray scattering function of boron nitride), the radiation resistance of the magnet is greatly improved, and the prepared neodymium-iron-boron magnet has the advantages of light weight and low-temperature forming; and the synergistic improvement of high radiation resistance and excellent magnetic performance can be met at the same time. The high-radiation-resistance bonded neodymium-iron-boron magnet prepared based on the neodymium-iron-boron magnet can keep stable magnetic performance in an extreme environment with an accumulated radiation dose of more than 1MGy.

The invention relates to the production of radiation-shielding zinc-barium-borosilicate glass materials, in particular for X-rays and / or gamma-rays and / or fast neutrons and the like, from readily available, low-cost and abundant available starting materials by means of uniquely designed glass compositions. Sodium oxide (Na2O), silicon dioxide (SiO2), boron oxide (B2O3), calcium oxide (CaO), barium oxide (BaO), zinc oxide (ZnO), bismuth oxide (Bi2O3), gadolinium oxide (Gd2O3) and cerium oxide (CeO2) are used in particular, when mixed, a satisfactory and effective shielding effect against X-rays and / or gamma-rays and / or fast neutrons and the like is provided.

This invention relates to the field of shielding materials, and more particularly to a natural rubber-based ionizing radiation shielding material and its preparation method. The material comprises the following components: natural rubber: 60-80 parts; nano-boron carbide: 5-15 parts; nano-high-density metal powder: 15-23 parts; modified gadolinium oxide: 3-10 parts; plasticizer: 3-8 parts; vulcanizing agent: 1-3 parts; accelerator: 0.5-2 parts; antioxidant: 1-2 parts. This invention can effectively shield ionizing radiation while retaining the high elasticity and flexibility of natural rubber, and possesses good processing performance and low cost, thus meeting the diverse needs of different fields for ionizing radiation shielding materials.

To develop a composite of a new constitution containing a powder having a radiation shielding function in a high content.SOLUTION: Molten aluminum is impregnated and filled into all voids of a preform made of a mixture containing one or more kinds of radiation shielding powders selected from gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder, and ferrite powder and a liquid silica-based binder, the mixture containing the radiation shielding powders in a range of 3 to 85% in total; In the composite body having the radiation shielding function and the method for manufacturing the same, a liquid organic-inorganic sealing agent is impregnated and solidified to form the composite body, and a liquid silica-based binder has characteristics capable of forming a preform at a temperature at which the radiation shielding powder is not decomposed.SELECTED DRAWING: None

A rare-earth-doped aluminum-based composite material for shielding spent nuclear fuel comprises, by weight percentage: gadolinium oxide 1 wt.%–10 wt.%, europium oxide 1 wt.%–10 wt.%, samarium oxide 1 wt.%–10 wt.%, dysprosium oxide 1 wt.%–10 wt.%, erbium oxide 1 wt.%–10 wt.%, with the remainder being 6063 aluminum alloy powder. This invention exhibits excellent neutron absorption capacity. The aluminum-based material maintains both low weight and high strength and ductility. Furthermore, the addition of rare-earth elements such as Gd, Eu, and Sm, which have high thermal neutron absorption cross-sections, significantly enhances the material's neutron absorption capacity. The introduction of rare-earth elements such as Gd, which react with neutrons in an (n,γ) reaction, effectively prevents the formation of numerous helium bubbles in the matrix, thus improving the material's practical service life.

Disclosed is a radiation shielding zinc-barium-borosilicate glass material produced from easily accessible, low-cost and abundantly available starting raw materials, particularly for X-rays and / or gamma rays and / or fast neutrons and / or the like, having unique glass compositions. In particular, disclosed is the use of sodium oxide (Na2O), silicon dioxide (SiO2), boron oxide (B2O3), calcium oxide (CaO), barium oxide (BaO), zinc oxide (ZnO), bismuth oxide (Bi2O3), gadolinium oxide (Gd2O3) and cerium oxide (CeO2), which when mixed provides a satisfactory and effective shielding effect against X-rays and / or gamma rays and / or fast neutrons and / or the like.

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 invention provides low-temperature high-density gadolinium oxide doped cerium oxide powder and a preparation method thereof, and belongs to the field of solid oxide fuel cells. The preparation method comprises the following steps: taking a soluble cerium source, a soluble gadolinium source, a soluble iron source and a soluble cobalt source as raw materials, adding a first surfactant, and preparing FeCo-GDC precursor powder through a sol-gel method or a coprecipitation method; adding a second surfactant into the precursor powder, and carrying out sanding dispersion, spray drying and calcination to obtain a FeCo-GDC powder crude product; and carrying out ball milling on the FeCo-GDC powder crude product, and drying to obtain the low-temperature high-density gadolinium oxide doped cerium oxide powder. According to the invention, the soluble iron source and the soluble cobalt source are also introduced into the raw materials, and the first surfactant and the second surfactant are introduced in the preparation process, so that the nanoscale GDC powder with uniform particle size distribution can be obtained, a compact GDC diffusion barrier layer is formed on a smooth electrolyte layer at 1100-1250 DEG C, and the long-term stability of the battery is improved.

The present invention belongs to the field of high-temperature superconducting materials and particularly relates to a gadolinium ytterbium barium copper oxide superconducting film and a preparation method and application thereof. The preparation method comprises the following steps: S1, preparing a solution containing 2-thenoyltrifluoroacetone; S2, adding gadolinium oxide and ytterbium oxide to react with nitric acid to obtain a mixed solution containing gadolinium nitrate and ytterbium nitrate, mixing the solution obtained in S1 with the mixed solution, adding seed crystals to react, standing, separating and drying to obtain a gadolinium ytterbium coordination complex; S3, mixing the gadolinium ytterbium coordination complex obtained in S2, a barium source, a copper source and a solvent, and growing the gadolinium ytterbium barium copper oxide superconducting film on a substrate surface by an organometallic chemical vapor deposition method using oxygen as an oxygen source; the molar ratio of gadolinium nitrate to ytterbium nitrate is (0.7-0.78):(0.22-0.3). The gadolinium-ytterbium coordination complex prepared by the invention has good volatility and high thermal stability; the generated film has few impurities and holes, a smooth surface, and excellent electrical and magnetic field properties at low temperature and high field.

The invention discloses a Gd (III) complex solvent paramagnetic relaxation enhanced probe and a preparation method thereof, and belongs to the technical field of biological macromolecule nuclear magnetic resonance analysis. The Gd (III) complex is provided with a large cyclic ligand, diethylene triamine pentaacetic acid dianhydride (DTPAA) and 1, 8-diamino-3, 6-dioxaoctane are subjected to a reaction under the catalysis of triethylamine, and a cyclic compound DTPA-BAE is generated; and carrying out coordination with gadolinium oxide to obtain the Gd (III) complex Gd-DTPA-BAE. Due to the fact that the ligand is in a large ring shape instead of a chain shape, Gd < 3 + > is not prone to being separated, the chemical stability of the Gd-DTPA-BAE serving as the solvent paramagnetic relaxation enhancing probe is higher, the coordination number is as high as 10, hydrophobicity is weak, the system error of solvent relaxation enhancing determination is reduced, and the accuracy of protein dynamic structure determination is improved.

This invention discloses a holmium ion-doped yttrium gadolinium oxide single-crystal optical fiber, its preparation method, and its applications, belonging to the field of laser materials and laser technology. The chemical formula of the single-crystal optical fiber is Ho. 3+ YGdO3, wherein the Ho ion doping concentration is 0.2-1.0 at.%, is a cubic C-type sesquioxide crystal structure with space group Ia-3. This crystal exhibits characteristic absorption peaks at wavelengths of 1100-1200 nm and Ho-derived absorption peaks at 2.80-2.90 μm. 3+ ion 5 I6→ 5 Broad-spectrum mid-infrared fluorescence emission with I7 level transition; this crystal possesses a wide gain bandwidth, a large emission cross section, and excellent thermal properties, making it less prone to thermal lensing and thermal depolarization under continuous or high-repetition-rate pumping of single-crystal fibers, thus ensuring high stability of laser output. It is particularly suitable for realizing broadband tunable and ultrafast mode-locked mid-infrared lasers, and has broad application prospects in laser surgery, environmental monitoring, remote sensing, and other fields.

The application belongs to the technical field of high-entropy materials, and discloses a composite ceramic of Cr2O3-coated high-entropy pyrochlore and a preparation method and application thereof. 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Sc 0.2 )2Zr2O7, wherein x is 5-20 wt.%; the composite ceramic is prepared by 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, stirring the high-entropy pyrochlore powder in a CrCl3 solution after ball milling, drying to obtain CrCl3-coated high-entropy pyrochlore powder, cold sintering the CrCl3-coated high-entropy pyrochlore powder at 200-400 DEG C and 200-500 MPa, then heat preservation at 800-900 DEG C, and then pressureless sintering at 1500-1700 DEG C. The composite ceramic has high density, excellent radiation resistance and leaching resistance, and can be applied in the field of nuclear waste solidification.

The invention relates to the technical field of biomedical materials, in particular to a gadolinium oxide-based nano preparation as well as a preparation method and application thereof. The preparation method of the preparation comprises the following steps: preparing gadolinium oxide nanoparticles through a hydrothermal method and amination modification, and dissolving the gadolinium oxide nanoparticles in deionized water to obtain a contrast agent solution; dropwise adding the nano-particles into a gold source solution under stirring at a certain temperature to obtain nano-particles with core-shell structures; and finally, slowly adding the synthesized dispersant solution of the water-soluble polymer into the core-shell nanoparticle solution to obtain a gadolinium oxide-based nano preparation solution. And performing post-treatment such as dialysis, freeze drying and the like to obtain the core-shell structure nanoparticles based on the gadolinium oxide nano preparation. The invention relates to a gadolinium oxide-based nano preparation for cancer diagnosis and treatment, gadolinium oxide is used as an MRI contrast agent, and a gold shell is grown on the periphery of the gadolinium oxide as a photo-thermal preparation; the hydrogel has the characteristics of good biocompatibility and the like, and has an important practical prospect in the field of preparation of diagnosis and treatment integrated medicines.