10 results about "Garnet crystals" patented technology

The invention relates to an iron-based gyromagnetic material calculated based on a first principle and a screening method thereof, the crystal structure of the material is a garnet structure, and the chemical general formula of the material is Sr < x > Y < 3-x > Scy Fe < 5-y > O < 12 >, the value range of x is 0 lt; xlt; 3, the value range of y is 0 lt; yt; Yt; 5. On the basis of a first principle calculation result, a specific doping combination capable of remarkably improving the dielectric constant and improving the saturation magnetization intensity is screened out, namely, a double-ion co-doping strategy that c site is replaced by Sr and a site is replaced by Sc is adopted. According to the method, experiments are guided through theoretical calculation, the problems that a traditional trial-and-error method is long in period and large in blindness are effectively solved, and the iron-based gyromagnetic material with excellent electromagnetic performance is obtained.

The application discloses a rare earth ion doped magnesium calcium germanate zirconate fluorescent powder and a preparation method thereof. 3‑x MgZrGe3O 12 :xR, wherein 0.005<=x<=0.500. Ca3MgZrGe3O 12 :xR as a matrix material, and the doped R as a central light emitting ion, and R is one or a combination of several of rare earth Ce, Tb, Eu, Dy, Sm, Bi and Cr ions. The fluorescent powder is prepared by a high-temperature solid phase method. Powder diffraction data show that the sample belongs to a garnet crystal phase. The prepared fluorescent powder can be excited by violet light or blue light, and has a strong light output in a visible light region. The magnesium calcium germanate zirconate fluorescent powder is simple to manufacture, has good light stability, and can be used for a light emitting layer of a white light LED.

This utility model discloses an online monitoring device for transformer winding temperature based on fiber optic temperature measurement, belonging to the field of temperature monitoring technology. It includes a temperature probe, a fiber optic transmission assembly, a control box, and a display panel. The temperature probe is composed of a quartz optical fiber coated with a high-temperature resistant polyimide coating. A europium-doped yttrium aluminum garnet crystal temperature sensor is fused to the end of the fiber. The temperature sensor is covered with an alumina ceramic protective layer. The temperature probe is embedded in the interlayer gap of the transformer winding conductors. The fiber optic transmission assembly uses a double-armored composite optical cable, with both ends connected via fiber optic connectors. The control box includes a metal heat sink, a detection circuit housed within the casing, and a microcontroller. The display panel is integrated onto the surface of the control box and electrically connected to the microcontroller. The display panel also includes a dual-color LED alarm light group and a miniature buzzer. This utility model can accurately and stably measure the temperature of transformer windings and achieve online monitoring.

The invention provides a high-energy thulium pump holmium laser oscillation amplifier, and belongs to the technical field of solid lasers, and the high-energy thulium pump holmium laser oscillation amplifier comprises a pumping source which comprises a thulium-doped yttrium aluminum garnet crystal and is used for outputting pumping laser of a first wavelength; the oscillator comprises a holmium-doped yttrium aluminum garnet crystal and is used for generating seed laser with a second wavelength by taking the pump laser as pump light; the amplifier comprises a holmium-doped yttrium aluminum garnet crystal and is used for amplifying the seed laser by taking the pump laser as pump light; wherein the first wavelength is not located on an absorption main peak of the holmium-doped yttrium aluminum garnet crystal. According to the invention, high-energy narrow-pulse two-micron laser output is realized, and meanwhile, good thermal management performance and system stability are achieved.

The utility model relates to a film plating fixture technical field, especially a kind of chromium-doped yttrium aluminium garnet crystal's film plating fixture, including mounting seat;And, drive assembly, including screw rod, the inner tangent ring being set in the outer wall of screw rod and the moving block being set in the end surface of inner tangent ring, the outer wall both sides of screw rod are equipped with the thread of opposite rotation;And, clamping assembly, including the positioning plate being set in the outer side of moving block and the positioning part being set in the end surface of positioning plate, drive assembly further include the motor being set in the outer side of mounting seat, the outer wall of motor is fixedly connected with first mounting plate, first mounting plate is L type structure design, first mounting plate is installed in mounting seat end surface, the utility model is positioned to the yttrium aluminium garnet crystal by the replaceable clamping assembly, since yttrium aluminium garnet crystal has multiple shapes, utilize the clamping of replaceable clamping part can satisfy the clamping demand under different conditions, cooperate drive assembly can make the stable clamping of clamping assembly to crystal.

The invention belongs to the technical field of magneto-optical crystal preparation, and relates to a bismuth-doped europium yttrium iron garnet magneto-optical crystal and a preparation method and application thereof. According to the preparation method, a magneto-optical crystal with a chemical formula of Eu < 3-x-y-z > Bi < x > Y < y > Tb < z > Fe < 5-w > Ga < w > O < 12 > is grown by adopting a top seed crystal method, wherein x ranges from 0.30 to 0.43, y ranges from 1.20 to 2.06, z ranges from 0.08 to 0.17, and w ranges from 0.09 to 0.17. The method has the advantages of high crystal growth speed, simple process and the like, and can be used for preparing centimeter-level single crystals. A Bi2O3-Fe2O3 self-service solvent is used for crystal growth, and compared with a Pb-containing cosolvent system, the Bi2O3-Fe2O3 self-service solvent is more environmentally friendly, and harm to a human body and pollution to the environment can be reduced. The Faraday rotation angle of the garnet crystal can be increased by doping Bi in a proper amount.

This invention discloses a temperature field for epitaxial growth of garnet crystals, comprising a crucible, a central shaft, a clamp, and a substrate. Molten liquid is contained in the lower part of the crucible, and one end of the central shaft is connected to the clamp, which holds the substrate, which rotates on the surface of the molten liquid. A first heater and a second heater are disposed around the outer periphery of the crucible, respectively located at the lower and upper parts of the crucible. The heat generated by the first heater heats the molten liquid through the sidewall of the crucible; the heat generated by the second heater heats the internal gas of the crucible through the sidewall, ensuring a uniform temperature throughout the crucible. Crystallization occurs only on the surface of the substrate. The resulting garnet crystals have a crack-free, line-free, and impurity-free surface, exhibit consistent growth rates at all locations, uniform thickness, and meet the required epitaxial dimensions. This invention also provides a method for growing garnet crystals.

To provide an additive which can be added to an electrode of a lithium ion secondary battery to improve its characteristics.SOLUTION: An additive for a lithium ion secondary battery electrode, comprising a composite oxide having a garnet-type or garnet-like crystal structure containing elements Li, La, Zr, and O, wherein a part of the elements Li is substituted with an element A which is different from the elements and can form a Li site vacancy, a ratio of the Li site vacancies is 40% or more and 80% or less, and an ionic conductivity at room temperature is 1 * 10 - 5S / cm or more.SELECTED DRAWING: Figure 2

The present invention provides: a phosphor including a garnet crystal phase having a composition represented by formula [α] [CexA1-x]3D2E3O12 (A represents at least one selected from Ca, Mg, and Sr, D represents at least one selected from Al, Ga, and In, E represents at least one selected from Si and Ge, and x represents a positive number that satisfies formula 0<x≤0.3); a method for producing said phosphor, the method comprising a formulation step for preparing raw materials formulated so as to achieve an elemental proportion of the composition represented by formula [α], a mixing step for mixing the raw materials to obtain a mixture, and a high pressure synthesis step for subjecting the mixture to high pressure synthesis to obtain the intended phosphor; and a light-emitting device comprising said phosphor and an excitation light source that emits light for exciting the phosphor. The present invention provides: a Ce3+ activated garnet phosphor that has a composition having less content of rare-earth elements or not containing a rare-earth element, that is stable under ordinary temperatures and ordinary pressures, and that has excellent light emission properties; a method for producing the same; and the like.