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Apatite type silicate terbium magneto-optical crystal and preparation method thereof

A technology of magneto-optic crystal and terbium silicate, which is applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problem of no breakthrough in high-quality TGG crystal growth technology, expensive raw materials for TGG crystal synthesis, and unfavorable magneto-optical devices. Miniaturization and other issues, to achieve excellent magneto-optical effect, to achieve large-scale low-cost mass production, and short cycle effects

Inactive Publication Date: 2014-06-04
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Terbium-doped glass and terbium-gallium garnet (TGG) crystals have high transmittance in the visible-near-infrared region, but the Faraday rotation angle is relatively small, and the size of the prepared device is large, which is not conducive to the development of magneto-optical devices. miniaturization
At the same time, the growth technology of high-quality TGG crystals has not yet broken through, and the crystals obtained by growth have a large extinction ratio and a 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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  • Apatite type silicate terbium magneto-optical crystal and preparation method thereof
  • Apatite type silicate terbium magneto-optical crystal and preparation method thereof
  • Apatite type silicate terbium magneto-optical crystal and preparation method thereof

Examples

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Effect test

Embodiment 1

[0017] Embodiment 1: growth of apatite type Tb by melt pulling method 9.33 (SiO 4 ) 6 o 2 Magneto-optic crystals.

[0018] will press Tb 9.33 (SiO 4 ) 6 o 2 Stoichiometric ratio of accurately weighed Tb 4 o 7 (99.99%), SiO 2 (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 1400° C. and carry out the solid phase reaction again for 16 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 0.5 mm / h, and the crystal rotation ...

Embodiment 2

[0020] Embodiment 2: growth of apatite type Tb by melt pulling method 9 (SiO 4 ) 6 o 1.5 Magneto-optic crystals.

[0021] will press Tb 9 (SiO 4 ) 6 o 1.5 Stoichiometric ratio of accurately weighed Tb 4 o 7 (99.99%), SiO 2 (99.95%) was put into a corundum mortar, mixed and ground evenly, and after being pressed into tablets, it was placed in a muffle furnace at 900°C for 20 hours of solid-state reaction. After taking it out, grind it again, press it into tablets, raise the temperature to 1400° C. and carry out the solid phase reaction again for 24 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 2000° C., the growth rate is 2.0 mm / h, and the cry...

Embodiment 3

[0022]Embodiment 3: growth of apatite type Tb by melt pulling method 9.66 (SiO 4 ) 6 o 2.5 Magneto-optic crystals.

[0023] will press Tb 9.66 (SiO 4 ) 6 o 2.5 Stoichiometric ratio of accurately weighed Tb 4 o 7 (99.99%), SiO 2 (99.95%) was put into a corundum mortar, mixed and ground evenly, and after being pressed into tablets, it was placed in a muffle furnace at 900°C for 20 hours of solid-state reaction. After taking it out, grind it again, press it into tablets, raise the temperature to 1400° C. and carry out the solid phase reaction again for 24 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 1950° C., the growth rate is 1 mm / h, and the ...

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Abstract

The invention discloses an apatite type silicate terbium magneto-optical crystal which is high in transmittance rate and high in Verdet constant in a visible-near infrared region and a preparation method thereof. The crystal grows by a melt pulling method; the molecular formula is Tb(10-x)(SiO4)6O(3-1.5x), wherein x is equal to 0-2; the crystal belongs to a hexagonal crystal system, and the space group is shown in the specification. The magneto-optical crystal has a good magneto-optical effect, and the Verdet constant of the magneto-optical crystal is higher than that of the conventional commercially applied terbium-doped glass and terbium gallium game (TGG) crystals; meanwhile, at the waveband of 400-1,500nm except for 485nm where the magneto-optical crystal has a feature absorption peak of the Tb<3+> ion, the magneto-optical crystal has high transmittance rate at other waveband; particularly within the visible light waveband of 400-650nm, the transmittance rate of the magneto-optical crystal is obviously increased as compared with that of the TGG crystal, so that the magneto-optical crystal has a good application prospect when used as a magneto-optical material; furthermore, the magneto-optical is a congruent melting compound and can grow by an intermediate-frequency induction pulling method; the growth technology is simple, the period is short, and large-scale and low-cost batch production can be realized.

Description

technical field [0001] The invention belongs to the technical field of magneto-optical materials and crystal growth, in particular to a magneto-optic crystal of apatite type terbium silicate with high transmittance and high Verdet constant 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 an...

Claims

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Application Information

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IPC IPC(8): C30B29/34C30B15/00C30B33/02
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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