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Growth method of bismuth silicate monocrystal with hydrothermal method

A single crystal, bismuth silicate technology, applied in the directions of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of insufficient solubility, difficult process control, unfavorable growth of large crystals, etc., and achieve the effect of fast crystal growth.

Active Publication Date: 2010-02-10
CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of method using NaOH solution as a mineralizer to grow BSO single crystal by hydrothermal method, because the solubility of BSO crystal in NaOH solution is not large enough, it is not conducive to growing large crystals, and its process control is difficult

Method used

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  • Growth method of bismuth silicate monocrystal with hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]Weigh 50.24 grams of glassy BSO raw material about 1 cm in size as a culture material, place it at the bottom of a gold lining tube with a size of Φ17mm*240mm in the reaction chamber, and place a gold lining tube with a porosity of 7% in the middle and lower part of the gold lining tube. The baffle plate separates the lower culture material dissolution zone from the upper crystal growth zone; according to the filling degree of 75%, add a KF solution with a fluoride ion concentration of 4mol / L to the gold bushing tube, and place it on the top of the gold bushing tube Suspend the BSO seed wafer along the [100] direction, seal the gold bushing tube, and place it in the matching autoclave. Fill 70% of the volume of deionized water between the gold bushing tube and the interlayer of the autoclave to balance the pressure inside and outside the gold bushing tube, put the sealed autoclave into a two-stage heating resistance furnace, and set the lower section of the heating furnac...

Embodiment 2

[0026] Weigh 49.12 grams of glassy BSO raw material as a culture medium, and place it at the bottom of a gold lining tube with a size of Φ17mm*240mm in the reaction chamber; NaF solution, hang a gold wire on the top of the gold lining tube; seal the gold lining tube, and then put it into the matching autoclave. Fill 65% of the volume of deionized water between the gold bushing tube and the interlayer of the autoclave to balance the pressure inside and outside the gold bushing tube, put the sealed autoclave into a two-stage heating resistance furnace, and set the lower section of the heating furnace (ie the dissolution zone) average temperature is 365°C, and the average temperature of the upper section (ie the growth zone) is 335°C. After 90 days of constant temperature growth, yellow transparent BSO crystals with a particle size of 2-3mm are obtained.

Embodiment 3

[0028] Weigh 45.48 grams of glassy BSO raw material as a culture material, place it at the bottom of a gold liner tube with a size of Φ17mm*240mm in the reaction chamber, and place a gold baffle with an opening rate of 8% in the middle and lower part of the gold liner tube. The lower compost dissolution area is separated from the upper crystal growth area; according to the filling degree of 75%, a KF solution with a fluoride ion concentration of 0.3mol / L is added to the gold liner tube, and a tube is hung on the top of the gold liner tube Gold wire; the gold liner tube is sealed and placed in the accompanying autoclave. Fill 70% of the volume of deionized water between the gold bushing tube and the interlayer of the autoclave to balance the pressure inside and outside the gold bushing tube, put the sealed autoclave into a two-stage heating resistance furnace, and set the lower section of the heating furnace (that is, the dissolution zone) has an average temperature of 380°C, a...

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Abstract

The invention relates to a growth method of bismuth silicate (Bi12 SiO20, BSO for short) monocrystal with a hydrothermal method. The method is characterized in that crystal growth is executed by taking a fluoride mineralizer system. The method comprises the following steps: taking BSO raw materials as cultivation materials; putting the cultivation materials at the bottom of a golden lining sleeve;putting a golden baffle plate with 7-10% of aperture ratio at the middle lower part of the golden lining sleeve; separating a cultivation materials dissolving region at a lower part from a crystal growing region at an upper part; hanging seed crystal or gold wire at the top of the golden lining sleeve; adding fluoride solution with 0.3-6 mol / L of fluorine ion concentration into the golden liningsleeve according to 65-75% of filling degree; sealing the golden lining sleeve; putting the golden lining sleeve into a high pressure kettle; adding a certain quantity of deionized water or distilledwater into an interlayer between the golden lining sleeve and the high pressure kettle; sealing; heating; making the average temperature of the dissolving region be 365-420 DEG C and the average temperature of the growing region be 335-385 DEG C; and growing with constant temperature for 10-90 days to obtain the BSO monocrystal.

Description

technical field [0001] The invention relates to a method for preparing bismuth silicate crystals by a hydrothermal method, belonging to the field of inorganic non-metallic materials. Background technique [0002] Bismuth silicate (Bi 12 SiO 20 , hereinafter referred to as BSO) crystal is a multifunctional optical information material that collects electro-optic, photoconductive, photorefractive, piezoelectric, acousto-optic, optical rotation and magneto-optical effects. A current sensor has been developed by using the magneto-optic effect of BSO crystal, and a temperature compensation sensor has been successfully developed by using its optical rotation effect. At the same time, a sensor for simultaneously measuring current and voltage can be developed by using the electro-optic effect and magneto-optic effect of BSO crystal. In recent years, the photorefractive properties of BSO crystals in particular have attracted great attention. BSO crystal is one of the photorefracti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/34C30B7/10
Inventor 何小玲张昌龙王金亮霍汉德周海涛覃世杰张海霞
Owner CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD