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Cubic-phase fluorite type terbium and calcium niobate magneto-optical crystal and preparation method thereof

A terbium calcium niobate, magneto-optical crystal technology, applied in crystal growth, chemical instruments and methods, single crystal growth and other directions, can solve the problem of expensive TGG crystal synthesis raw materials, poor thermal and chemical stability of glass, unfavorable magneto-optical Device miniaturization application and other issues, to achieve the effect of large-scale low-cost mass production, excellent physical properties, and short cycle times

Active Publication Date: 2014-06-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with magneto-optical crystals, the Verdet constant of magneto-optic glass is smaller, and the thermal stability and chemical stability of glass are also poorer than crystals, so it is not conducive to the miniaturization of magneto-optical devices and the application on high-power devices. application
Terbium gallium garnet (TGG) crystals have high transmittance in the visible-near-infrared region, but the growth technology of high-quality TGG crystals has not yet broken through. Although the crystals are molten compounds with the same composition, Ga 2 o 3 Severe decomposition and volatilization can easily lead to wrapping inside the crystal, resulting in a large extinction ratio of the grown crystal and low yield
In addition, the raw materials for TGG crystal synthesis are expensive, and the high cost also affects the prospect of its application.

Method used

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  • Cubic-phase fluorite type terbium and calcium niobate magneto-optical crystal and preparation method thereof
  • Cubic-phase fluorite type terbium and calcium niobate magneto-optical crystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Growth of cubic phase fluorite-type Tb by melt pulling method 6 Ca 2 Nb 4 o 21 Magneto-optic crystals.

[0018] will press Tb 6 Ca 2 Nb 4 o 21 Stoichiometric ratio of accurately weighed Tb 4 o 7 (99.99%), CaCO 3 (99.95%), Nb 2 o 5 (99.95%) was put into a corundum mortar, mixed and ground evenly, and after tableting, it was placed in a muffle furnace at 900°C for 12 hours for solid-state reaction. After taking it out, grind it again, press it into tablets, raise the temperature to 1350° C. and carry out the solid phase reaction again for 12 hours to obtain the initial raw material for crystal growth. The size is φ60×40mm 3 The iridium crucible is used as a container for crystal growth, and the synthesized polycrystalline powder raw material is put into the container, put into a single crystal pulling furnace, and heated in N 2 Single crystal pulling is carried out under atmosphere. The growth temperature is 1750° C., the growth rate is 0.5 mm / h,...

Embodiment 2

[0020] Example 2: Growth of cubic phase fluorite-type Tb by melt pulling method 3 Ca 2 Nb 3 o 14 Magneto-optic crystals.

[0021] will press Tb 3 Ca 2 Nb 3 o 14 Stoichiometric ratio of accurately weighed Tb 4 o 7 (99.99%), CaCO 3 (99.95%), Nb 2 o 5 (99.95%) was put into a corundum mortar, mixed and ground evenly, and after tableting, it was placed in a muffle furnace at 900°C for 12 hours for solid-state reaction. After taking it out, grind it again, press it into tablets, raise the temperature to 1350° C. and carry out the solid phase reaction again for 12 hours to obtain the initial raw material for crystal growth. The size is φ60×40mm 3 The iridium crucible is used as a container for crystal growth, and the synthesized polycrystalline powder raw material is put into the container, put into a single crystal pulling furnace, and heated in N 2 Single crystal pulling is carried out under atmosphere. The growth temperature is 1900° C., the growth rate is 3.0 mm / h,...

Embodiment 3

[0022]Example 3: Growth of cubic phase fluorite-type Tb by melt pulling method 3 Ca 4 Nb 5 o 21 Magneto-optic crystals.

[0023] will press Tb 3 Ca 4 Nb 5 o 21 Stoichiometric ratio of accurately weighed Tb 4 o 7 (99.99%), CaCO 3 (99.95%), Nb 2 o 5 (99.95%) was put into a corundum mortar, mixed and ground evenly, and after tableting, it was placed in a muffle furnace at 900°C for 12 hours for solid-state reaction. After taking it out, grind it again, press it into tablets, raise the temperature to 1350° C. and carry out the solid phase reaction again for 12 hours to obtain the initial raw material for crystal growth. The size is φ60×40mm 3 The iridium crucible is used as a container for crystal growth, and the synthesized polycrystalline powder raw material is put into the container, put into a single crystal pulling furnace, and heated in N 2 Single crystal pulling is carried out under atmosphere. The growth temperature is 1845° C., the growth rate is 2.0 mm / h, ...

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Abstract

The invention discloses a cubic-phase fluorite type terbium and calcium niobate magneto-optical crystal applied in a visible-near infrared light area, and a preparation method thereof. The crystal is grown by adopting a flux czochralski method, the molecular formula of the crystal is Tb[3x]Ca[2-2x]Nb[2-2x]O7, wherein x is equal to 0-1, and the crystal belongs to a cubic crystal system, and the space group of the crystal is Fm-3m. The magneto-optical crystal has high transmittance in the visible infrared light area, is high in the content of magnetic rare earth ions, large in electron exchange action, and beneficial to achieving better magneto-optical property. In addition, the influence of crystalline double refraction on the magneto-optical effect can be effectively avoided through the isotropous characteristic of the cubic crystal system. In addition, the magneto-optical crystal is a congruent melt compound, can be grown by adopting medium-frequency induction czochralski method, the production technology is simple, and short in period, and the cubic-phase fluorite type terbium and calcium niobate magneto-optical crystal can be massively produced on large scale with low cost.

Description

technical field [0001] The invention belongs to the technical field of magneto-optical materials and crystal growth, and in particular relates to a cubic phase fluorite-type calcium terbium niobate magneto-optic crystal and a preparation method thereof. Background technique [0002] Magneto-optic crystals are an important class of optoelectronic functional materials. Optical isolators, laser modulators, magneto-optical switches, optical fiber current sensors, and other magneto-optical devices with opto-electromagnetic conversion functions can be made by using their unique Faraday effect. Strategic high-tech materials urgently needed by systems such as communications, optical networks, and information processing. [0003] Rare earth-doped garnet magneto-optic crystals occupy an important position among the mainstream magneto-optic crystal materials for commercial application at present. Such as yttrium iron garnet (YIG) and its doped series of crystals and thin films. This s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B15/00C30B33/02
Inventor 陈新万琦萍张文辉陈建中郭飞云庄乃锋宫仲亮
Owner FUZHOU UNIV
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