99 results about "Terbium" patented technology

The invention discloses a method for improving performance of rare earth permanent magnet sintered neodymium iron boron grain boundary diffusion, and belongs to the technical field of rare earth permanent magnet materials. The method comprises the steps that a low-melting-point metal layer and a diffusion layer containing heavy rare earth elements are sequentially formed on the surface of a clean sintered neodymium-iron-boron magnet, and then vacuum diffusion heat treatment and tempering treatment are conducted. Wherein the low-melting-point metal layer comprises at least one of copper, aluminum, gallium and tin or an alloy of the copper, the aluminum, the gallium and the tin; the heavy rare earth element comprises at least one of dysprosium, terbium, holmium and gadolinium. The low-melting-point metal layer is preferentially diffused and wets the grain boundary in the heat treatment process, heavy rare earth elements are promoted to be deeply and uniformly diffused towards the interior of the magnet along the grain boundary, so that a heavy rare earth-rich shell layer is formed outside main phase grains of the magnet, and the intrinsic coercive force is improved; meanwhile, the low-melting-point metal forms a strengthening phase at the grain boundary, the brittleness of the magnet after diffusion is improved, the surface corrosion phenomenon is restrained, and collaborative optimization of the comprehensive performance of the magnet is achieved.

The invention discloses a neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and a preparation method thereof, and relates to the technical field of neodymium-iron-boron magnet preparation, and the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet comprises the following preparation raw materials: 170-175 kg of PrNd (praseodymium-neodymium alloy), 25-30 kg of BFe (iron white copper), 1-5 kg of Co (cobalt), 0.1-2 kg of Cu (copper), 1-5 kg of Zr (zirconium), 0.1-1 kg of Ga (gallium) and 380-420 kg of Fe (iron). According to the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and the preparation method thereof, the 54H sintered neodymium-iron-boron magnet is prepared through a double-alloy technology with neodymium, iron and gallium as auxiliary alloy without adding dysprosium, terbium and other scarce type heavy rare earth elements, and performance optimization and cost optimization of the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet are achieved.

The invention relates to a lanthanide oxide electrochemiluminescence aptamer sensor with dual signal amplification for detecting acetamiprid as well as a preparation method and application of the lanthanide oxide electrochemiluminescence aptamer sensor. According to the sensor, terbium-doped europium oxide (Eu2O3: Tb < 3 + >) modified by gold nanoparticles (Au NPs) is used as a luminous body, and the electrochemical luminescence performance can be remarkably improved through multiple mechanisms: on one hand, the Au NPs can effectively promote generation of more sulfate free radicals; on the other hand, the surface defect passivation effect and the efficient synergistic effect of energy transfer jointly achieve effective amplification of signals. In addition, the wool ball-shaped Ag NPs is used as a plasma resonance signal amplification source, so that the ECL intensity of the sensor is further enhanced. The prepared electrochemical luminescence sensor with the dual signal amplification effect is used for detecting acetamiprid (ACE), has a wide linear range and a low detection limit, and has a wide application prospect in detection of acetamiprid residues in a water environment.

The invention is suitable for the technical field of heat treatment, and provides a metal deep ion nitriding heat treatment process which comprises the following steps: (a) preparing a quantum dot catalyst layer; (b) acoustic resonance plasma treatment; (c) magnetic field enhanced diffusion; (d) carrying out grain boundary passivation treatment; according to the preparation method, Fe3O4 (at) Gd quantum dots are deposited on a nanocrystallization surface, an electron conduction channel is provided by utilizing a Fe3O4 carrier, N2 molecules are captured by Gd < 3 + > through physical adsorption, unpaired electrons are injected into a pi orbit of the N2 molecules, so that N is equivalent to N bond energy is reduced, and the layer permeation time is shortened; the plasma sheath oscillation frequency is matched with the inherent frequency of the workpiece, acoustic resonance is excited, and the plasma penetration depth is increased; plasma forms a standing wave field on the surface of a workpiece, and the uniformity deviation of an infiltrated layer is reduced. The strong magnetic field perpendicular to the electric field is applied, so that electrons do spiral motion, the collision ionization probability is increased, and the deep nitrogen concentration is improved; through reaction of terbium steam and grain boundary impurities, a brittleness source is eliminated, and the impact toughness is improved.

The inventors have developed technology to improve the generation of daughter isotopes for clinical treatments. The technology includes systems and methods for using a liquid target to deliver parent isotopes to a reactor for neutron bombardment and subsequently separating desired daughter isotopes from the liquid target. According to an aspect of the technology described herein, a method of obtaining desired daughter isotopes comprises pumping a liquid target solution comprising a parent isotope through a fluid path that includes a first portion that passes through a fission reactor, a second portion that passes through a pump, and a third portion that passes through an isotope capture device.

The invention relates to a novel functional material for X-ray protection, in particular to a liquid metal flexible shielding material and a preparation method and application thereof. The material comprises liquid metal and solid metal, the liquid metal serves as a solvent to be filled in gaps of the solid metal, the liquid metal is gallium, gallium indium, gallium indium tin, gallium indium tin zinc or mercury, and the solid metal is selected from one or more of indium, tin, gold, platinum, iridium, zirconium, niobium, molybdenum, ruthenium, osmium, rhenium, rhodium, tungsten, antimony, palladium, tantalum, hafnium, lutetium, lead, ytterbium, thulium, bismuth, silver, erbium, holmium, dysprosium, terbium, gadolinium, samarium, neodymium, lanthanum, praseodymium, cerium and europium. On the basis of compounding of the liquid metal solvent and the solid metal solute based on the liquid metal combinatology, the liquid metal and the solid metal are jointly used for protecting X-ray radiation, the comprehensive performance of X-ray protection is improved, and meanwhile the variety and number range of selectable metal elements is widened.

The present invention proposes a method for manufacturing a TbDFe supermagnetic alloy based on stereolithography. The method first prepares a stereolithography slurry using a photosensitive resin as a matrix. A metal-organic chelating agent containing TbDFe supermagnetic alloy components is added to enhance the uniform distribution of the metal powder, ensuring printing accuracy and material stability. Next, degreasing is performed to remove the resin and chelating agent through heat treatment. The degreasing process is controlled by controlling the heating rate to avoid structural collapse. Decarburization is then performed in a low-oxygen atmosphere to improve the purity of the alloy and ensure structural integrity before sintering. A reduction treatment is then performed to improve structural stability and purity. Finally, high-temperature sintering is performed under the assistance of a magnetic field to optimize grain orientation and magnetic domain arrangement, thereby enhancing the magnetostrictive effect and force-to-magnetic energy conversion efficiency. This method combines stereolithography with magnetic field-assisted heat treatment, effectively avoiding the risk of structural damage during the printing of TbDFe supermagnetic alloy.

The invention provides a nano rare earth oxide as well as a preparation process and application thereof, and relates to the technical field of nano materials. The nano rare earth oxide is prepared from the following raw materials: rare earth ions, chitosan-hexadecyl trimethyl ammonium bromide, tea saponin, nano cellulose and a hydroxyapatite nano rod; the rare earth ions are selected from at least one of cerium ions Ce < 3 + >, yttrium ions Y < 3 + >, samarium ions Sm < 3 + >, terbium ions Tb < 3 + >, lanthanum ions La < 3 + >, praseodymium ions Pr < 3 + > and neodymium ions Nd < 3 + >. The prepared nano rare earth oxide can be used as an independent antibacterial agent, can also be used as a functional filler to be compounded with a polymer, and has application potential in the fields of medical instrument coatings, food packaging and the like.

The invention relates to a polycrystalline fused product of formula (Sc2O3)yAx(ZrO2 + HfO2)1-x-y, with 0.030 ≤ y ≤ 0.150, and 0.000 ≤ x ≤ 0.070, and x ≤ y, A denoting an additive selected from Y2O3, Al2O3, CeO2, Yb2O3, Gd2O3, MnO, Bi2O3, La2O3, Pr2O3, Nd2O5, Sm2O3, Eu2O3, Tb4O7, Ta2O5, Nb2O5 and mixtures thereof, ZrO2 + HfO2 + Sc2O3 + A representing more than 98% of the mass of the fused product, MnO expressing the total content of manganese oxides expressed in the form MnO, Pr2O3 expressing the total content of praseodymium oxides expressed in the form Pr2O3, Nd2O5 expressing the total content of neodymium oxides expressed in the form Nd2O5, Tb4O7 expressing the total content of terbium oxides expressed as Tb4O7, Ta2O5 expressing the total content of tantalum oxides expressed as Ta2O5, and Nb2O5 expressing the total content of niobium oxides expressed as Nb2O5.

The invention discloses a multicolor stress luminescent material for handwriting anti-counterfeiting and a preparation method thereof, the chemical general formula is Lu3-xAl2Ga3O12: xTb < 3 + >, 0.25% < = x < = 3.0%; the crystal structure is an Ia-3d cubic system, and the active ion is Tb < 3 + >. The preparation method comprises the following steps: weighing a lutetium-containing compound raw material, an aluminum-containing compound raw material, a gallium-containing compound raw material and a terbium-containing compound raw material, grinding and uniformly mixing to obtain a mixture, presintering, heating and calcining, cooling to room temperature, and grinding to obtain the terbium ion-doped multicolor stress luminescent material. The terbium ion-doped multicolor stress luminescent material disclosed by the invention has good stress luminescence self-recovery performance, shows different responses of energy level transition to stress in a visible light range, and is adjustable in color. The material has a low-threshold excitation characteristic, can provide multicolor stress luminescence response, and meets multicolor anti-counterfeiting requirements under different stress conditions.

The invention relates to preparation and application of a ruthenium-functionalized terbium-based metal organic framework fluorescence sensing material for uric acid detection. The preparation method comprises the following steps: S1, selecting raw materials; s2, dissolving pyrazinetetracarboxylic acid in secondary water, and stirring; s3, adding the solution obtained in S2 into a methanol solution of terbium nitrate, and stirring; s4, adding the solution obtained in S3 into a KOH solution, and stirring; s5, aging, alternately washing with distilled water and ethanol, centrifugally collecting white precipitate, and drying to obtain a white rare earth metal organic framework material; s6, dispersing the sample in an ethanol solution of Ru (bpy) 3 < 2 + >, and stirring; and S7, washing the solution obtained in the step S6 with ethanol, performing centrifugal separation to obtain a precipitate, and drying to obtain the ruthenium-functionalized terbium-based metal organic framework material. And S8, detecting uric acid in urine by using the obtained ruthenium functionalized terbium-based metal organic framework material. The ruthenium-functionalized terbium-based metal organic framework can be used as a ratio type fluorescent probe, and uric acid in urine can be identified and detected more sensitively and accurately.

The inventors have developed technology to improve the generation of daughter isotopes for clinical treatments. The technology includes systems and methods for using a liquid target to deliver parent isotopes to a reactor for neutron bombardment and subsequently separating desired daughter isotopes from the liquid target. According to an aspect of the technology described herein, a method of obtaining desired daughter isotopes comprises pumping a liquid target solution comprising a parent isotope through a fluid path that includes a first portion that passes through a fission reactor, a second portion that passes through a pump, and a third portion that passes through an isotope capture device.

The invention discloses a diffusion source and a diffusion method for improving the coercive force of a sintered neodymium-iron-boron magnet, and the diffusion source comprises the following components in atomic ratio: more than 80 at.% of heavy rare earth elements, 10-19 at.% of low-melting-point metal elements, not more than 0.2 at.% of high-melting-point metal elements, and not more than 1 at.% of magnetic elements, wherein the heavy rare earth element is at least one of dysprosium and terbium; the low-melting-point metal is at least one of aluminum, copper, gallium, tin and zinc; the high-melting-point metal is at least one of zirconium, vanadium, tungsten, niobium, titanium and manganese; the magnetic element is at least one of iron, cobalt and nickel. The diffusion effect of the diffusion source is remarkably improved by optimally designing the components, the adhesion mode and the diffusion process of the alloy diffusion source, and the diffusion source is mainly used for improving the coercive force of the sintered neodymium-iron-boron magnet through grain boundary diffusion and is particularly suitable for improving the coercive force of the sintered neodymium-iron-boron magnet with the thickness larger than 10 mm through grain boundary diffusion.

The invention discloses a high-strength and high-toughness ADC12 cast aluminum alloy and a preparation method thereof, and belongs to the technical field of aluminum alloy preparation. The ADC12 cast aluminum alloy comprises the following chemical components in percentage by weight: 9.6%-12.0% of Si, less than or equal to 1.3% of Fe, 1.5%-2.5% of Cu, less than or equal to 0.5% of Mn, less than or equal to 0.3% of Mg, less than or equal to 0.5% of Ni, less than or equal to 1.0% of Zn, less than or equal to 0.2% of Sn, 0.1%-0.3% of Tb and the balance of aluminum and inevitable impurity elements. According to the ADC12 cast aluminum alloy, the content of a copper element is reduced, and meanwhile, a trace amount of rare earth terbium element is added to refine a structure, so that the strength and the toughness are improved, and the strength reduction caused by the reduction of the copper element is made up. Meanwhile, artificial aging treatment is provided, and the strength is further improved by separating out a secondary strengthening phase, so that the ADC12 material which is low in cost, high in strength and high in toughness is developed, and the high-strength requirement under the extreme condition is met.

The application relates to preparation and application of a dye-functionalized rare earth metal organic framework material capable of recognizing sulfur ions: S1, selecting raw materials, terbium nitrate, pyrazine tetramethanic acid, potassium hydroxide and rhodamine B; S2, dissolving the pyrazine tetramethanic acid in distilled water and stirring; S3, adding the Tb(NO3)3.6H2O methanol solution obtained in S2 into the solution, and stirring; S4, adding the KOH solution into the solution obtained in S3, and stirring; S5, standing, centrifugally collecting the white precipitate, and drying after washing to obtain the white rare earth metal organic framework material; S6, immersing the sample in different concentrations of rhodamine B dyes for treatment; S7, collecting the purple red precipitate in S6, and drying to obtain the dye-functionalized rare earth metal organic framework material; and S8, using the obtained dye-functionalized rare earth metal organic framework material for sulfur ion detection. The preparation of the dye-coated rare earth metal organic framework is that the rare earth metal organic framework is coated with different concentrations of rhodamine B dyes, can be used as a ratio type fluorescent probe, and can more sensitively and accurately recognize and detect sulfur ions.

The invention relates to a method for growing a terbium lithium fluoride magneto-optical crystal by using a fluxing agent. The process comprises the following steps: (1) fully mixing a fluxing agent with raw materials; (2) putting the mixture into a crucible, feeding the crucible into a high-temperature molten salt furnace, vacuumizing the furnace, and introducing protective gas; and (3) controlling the heating rate, heating until the mixture is completely molten, and keeping the temperature for several hours. And (4) slowly cooling until crystals are completely separated out. And (5) annealing to room temperature to obtain the terbium lithium fluoride crystal. Tests show that the terbium lithium fluoride crystal prepared by the method is good in quality, large in extinction ratio and high in damage threshold, has relatively high transmittance and relatively strong magneto-optical performance in wave bands of 505nm, 633nm, 880nm and 1064nm, and is expected to be practically applied to magneto-optical devices such as magneto-optical isolators, Faraday rotators and the like.

Provided is an aluminum alloy powder comprising 0.1-2.0 mass% or one or more metal elements from among rare earth metal elements comprising the lanthanide elements and yttrium, wherein the iron content is suppressed to not more than 2.0 mass%. The rare earth metal element is preferably one of praseodymium, neodymium, europium, samarium, terbium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.

The application provides a high-brightness GAYAG fluorescent powder and a preparation method thereof, and belongs to the technical field of fluorescent materials. The preparation method comprises the following steps: weighing GAYAG fluorescent powder raw materials, cerium raw materials and an activator according to proportions; mixing the GAYAG fluorescent powder raw materials and the cerium raw materials, preheating to 200-300 DEG C, and then adding the activator for the first time, uniformly mixing, and then heat preservation; heating to 1000 DEG C + / - 10 DEG C, and then adding the activator for the second time, uniformly mixing, and then heat preservation; heating to 1200 DEG C + / - 10 DEG C, and then heat preservation; heating to 1400-1800 DEG C, and then heat preservation; naturally cooling to room temperature; the GAYAG fluorescent powder raw materials comprise yttrium oxide, aluminum oxide, gallium oxide, terbium oxide, bismuth oxide and antimony oxide; and the activator is europium oxide. The application adds the europium element in steps, controls the synthesis temperature and the heat treatment ladder steps, makes the fluorescent powder brightness crystal form multiple light emitting centers, increases the absorption light source range, makes the fluorescent powder reach the brightening effect, and thus improves the quality of LED lighting.

To provide a multilayer electronic component that meets the target TCC characteristics and offers excellent reliability even when high voltage is applied. [Solution] The stacked electronic component includes a body containing a dielectric layer and internal electrodes, and external electrodes disposed on the body. The dielectric layer contains a plurality of dielectric crystal grains, and at least one of the plurality of dielectric crystal grains has a core-double shell structure including a core 11, a first shell 12 surrounding at least a part of the core, and a second shell 13 surrounding at least a part of the first shell. The first shell and the second shell contain rare earth elements, including at least one of gadolinium (Gd), yttrium (Y), dysprosium (Dy), and terbium (Tb). The average atomic percentage of rare earth elements in the first shell is higher than the average atomic percentage of rare earth elements in the second shell, and the average atomic percentage of rare earth elements in the first shell is 4.0 at% or more and 6.0 at% or less.

This invention discloses a method for preparing high-purity terbium-iron alloy, utilizing ferric fluoride as a chemical decalcification agent in the refining stage. Compared with existing technologies that rely solely on high-temperature volatilization and physical adsorption for calcium removal, this method provides a clear chemical driving force, converting calcium dissolved in the alloy melt into an insoluble calcium fluoride slag phase through a displacement reaction, thereby achieving efficient calcium removal. This invention can reduce the calcium content in terbium-iron alloy from 0.011-0.015% in traditional processes to 0.002-0.004%, a reduction of 70-85%. This method requires no special equipment; only the addition of ferric fluoride in the refining stage is needed, resulting in low process modification costs and good industrial applicability.

This invention relates to the field of brazing technology, and discloses a Yb and Tb co-doped alloy brazing filler metal, its preparation method, and brazing process. The mass percentage of each component in the Yb and Tb co-doped alloy brazing filler metal is: 12-13% chromium, 3-4% boron, 3-4% silicon, 4-5% iron, 0.5-2% terbium, 0.5-1.5% ytterbium, with the balance being nickel. Yb and Tb co-doping effectively suppresses dendrite growth, and rare earth elements readily accumulate at grain boundaries, forming a fine equiaxed crystal structure. The prepared Yb and Tb co-doped alloy brazing filler metal results in less thermal damage when brazing diamond, a smoother brazed surface without accumulation, and significantly reduced wrinkles and pores. Rare earth co-doping improves the wettability of the brazing filler metal, and the brazing filler metal undergoes intense chemical metallurgy with diamond, increasing the interfacial bonding strength between the filler metal and diamond, thereby improving the machining performance of diamond tools.

The application belongs to the technical field of Nd-Fe-B magnets, and relates to a high-coercivity Nd-Fe-B magnet and a preparation method thereof. The grain boundary triple point of the magnet is enriched with oxides of M and / or R. R is at least one of dysprosium, terbium, holmium and praseodymium. M is at least one of zirconium, titanium, tungsten, molybdenum, ruthenium, vanadium and manganese. The Nd-Fe-B magnet is added with metal salt powder of rare earth elements, and the rare earth element metal oxides are enriched at the grain boundary triple point. Since the oxides have a large number of oxygen vacancy type point defects, the grain boundary of the magnet is thickened, the flipping of magnetic domains is hindered under an external magnetic field, the rare earth element metal oxides play a pinning role, and thus the coercivity of the Nd-Fe-B magnet is improved.

The application provides a terbium-free sintered neodymium-iron-boron permanent magnet and a preparation method thereof, and belongs to the technical field of permanent magnets.The terbium-free sintered neodymium-iron-boron permanent magnet is obtained by mixing a base alloy cast piece with a specific composition, a dysprosium alloy cast piece with a specific composition and dysprosium oxide, and sequentially performing hydrogen crushing, airflow milling, orientation forming, sintering and tempering treatment.The dysprosium alloy cast piece and the dysprosium oxide are used as auxiliary alloys, the microstructure of the base alloy cast piece can be controlled through the hydrogen crushing process, the airflow milling process and the sintering process and the tempering treatment process, and finally, the terbium-free high-performance neodymium-iron-boron permanent magnet is prepared, the scarce rare earth resource terbium is saved to a certain extent, the production cost is reduced, and the balanced utilization of the rare earth resource is promoted.

The application provides an ultrasonic atomization variable-frequency nozzle and a design method, which comprises third, second, terbium-dysprosium-iron hollow rods, first amplitude rods, matching blocks and pressing blocks arranged in sequence; wherein first, second, third, fourth and fifth electrode sheets, first, second, third, fourth and fifth piezoelectric ceramics are sequentially arranged from right to left between the matching block and the first amplitude rod; the coil is wound outside the terbium-dysprosium-iron hollow rod; after the first, second, third, fourth and fifth electrode sheets are connected to an alternating power supply, the fourth, third, second and first piezoelectric ceramics convert electric energy into mechanical energy through the inverse piezoelectric effect, the vibration amplitude is amplified through the first, second and third amplitude rods, and the micron-sized mist droplets are formed through the surface tension wave and cavitation effect acting on the liquid medicine.

This invention relates to a scandium-terbium-gallium garnet magneto-optical crystal without radial stripes and its preparation method. The Tb3Sc crystal was grown using the Czochralski method. x Ga 5‑x O 12 The magneto-optical crystal (where x = 0.05–0.3) belongs to the cubic crystal system and has the space group Ia–3d. This method utilizes a small amount of Sc... 3+ Partial Ga doping 3+ This helps suppress the formation of spiral dislocation-related defects, enabling the growth of high-quality terbium gallium garnet magneto-optical crystals without radial stripes. Low-concentration Sc 3+ The doping strategy has shown excellent results in addressing the radial stripe defect in TGG crystals and improving their key performance characteristics, providing a practical new approach for the fabrication of core materials for magneto-optical devices. This crystal material is expected to find practical applications in magneto-optical devices such as magneto-optical isolators, magneto-optical circulators, and magneto-optical modulators.

The application relates to the technical field of neodymium-iron-boron magnets, in particular to a neodymium-iron-boron magnet production line and a production process, wherein the production process comprises, in sequence, a vacuum strip casting furnace, a smelting furnace, a hydrogen crushing furnace, an air flow furnace, a stirring furnace, a sintering furnace, a cutting device, a polishing device, a surface dysprosium and terbium permeation device, a drying device and a magnetizing device; the neodymium-iron-boron magnet prepared by the application has the advantages of high magnetic energy, high coercive force and high magnetic saturation, and is not prone to collapse, so that the quality of the neodymium-iron-boron magnet is effectively improved.

Disclosed herein are magnetocaloric materials comprising alloys useful for magnetic refrigeration applications. The disclosed alloys include Dysprosium, Erbium, Holmium, Yttrium, or Terbium, and Cerium, Neodymium, and / or Gadolinium components that are fairly inexpensive. In certain embodiments, the materials exhibit second-order magnetic phase transitions near their Curie temperatures with negligible thermal and structural hysteresis losses, making them attractive for magnetic refrigeration. Surprisingly, the performance of the disclosed materials is comparable to or better than that of other expensive, rare-earth-based magnetocaloric materials.

The present disclosure to an oxide target material and a preparation method thereof. The oxide target material includes an oxide of an element A, an oxide of an element B, an oxide of an element R, and an oxide of an element M, wherein the element A is indium; the element B is selected from the group consisting of gallium, zinc, and tin, or a combination of two or more thereof; the element R is selected from the group consisting of cerium, praseodymium, ytterbium, dysprosium, and terbium, or a combination of two or more thereof; and the element M is selected from the group consisting of scandium, silicon, titanium, tantalum, germanium, and antimony, or a combination of two or more thereof. The present disclosure refines a grain size of the oxide target material by introducing the oxide of the element M into the oxide target material.

The application relates to a thulium-terbium co-doped calcium yttrium aluminate near-infrared waveband laser crystal and a preparation method and application thereof. x Tb y CaY 1‑x‑y AlO4, wherein the value range of x is 0.001-0.05, the value range of y is 0.0001-0.002, the space group is I4 / mmm, and the crystal is tetragonal. Compared with the prior art, the laser crystal can efficiently realize near-infrared waveband laser output near 1.5 microns and can be applied to the fields of medical treatment, military affairs, communication detection and the like.

The invention relates to an electrochemical device comprising and powder of a polycrystalline fused product of formula (Sc2O3)yAx(ZrO2 + HfO2)1-x-y, with 0.030 < y < 0.150, and 0.000 ≤ x ≤ 0.070, and x ≤ y, A denoting an additive selected from Y2O3, Al2O3, CeO2, Yb2O3, Gd2O3, MnO, Bi2O3, La2O3, Pr2O3, Nd2O5, Sm2O3, Eu2O3, Tb4O7, Ta2O5, Nb2O5 and mixtures thereof, ZrO2 + HfO2 + Sc2O3 + A representing more than 98% of the mass of the fused product, MnO expressing the total content of manganese oxides expressed in the form MnO, Pr2O3 expressing the total content of praseodymium oxides expressed in the form Pr2O3, Nd2O5 expressing the total content of neodymium oxides expressed in the form Nd2O5, Tb4O7 expressing the total content of terbium oxides expressed as Tb4O7, Ta2O5 expressing the total content of tantalum oxides expressed as Ta2O5, and Nb2O5 expressing the total content of niobium oxides expressed as Nb2O5.