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Device and method of growing 500-1000mm long bismuth germanate crystals by descent method

A technology for growing crystals and bismuth germanate, which is applied in the directions of single crystal growth, single crystal growth, crystal growth, etc., and can solve problems such as difficulty

Active Publication Date: 2012-11-21
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In my country, the descending method is mainly used to grow BGO crystals. Although it has unique advantages in mass production, it is extremely difficult to prepare 500-1000mm long bismuth germanate crystals due to the limitations of the furnace size of the preparation equipment and the growth process.
Therefore, there are no public reports of bismuth germanate crystals with a length greater than 400 mm in the world so far.

Method used

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  • Device and method of growing 500-1000mm long bismuth germanate crystals by descent method
  • Device and method of growing 500-1000mm long bismuth germanate crystals by descent method
  • Device and method of growing 500-1000mm long bismuth germanate crystals by descent method

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Prepare 600mm long bismuth germanate crystals, the specific preparation method is as follows:

[0047] Mix bismuth trioxide and germanium dioxide with a purity of more than 4N according to the stoichiometric ratio of 2:3, put them in a platinum crucible, raise the temperature above the melting point and keep it warm for about 10-60 minutes to completely melt the raw materials and quickly Inject it into a mold and cool down to obtain a polycrystalline ingot.

[0048] A 3-layer platinum sheet with a thickness of 0.16mm is made into a section of 30×30mm 2 , A cuboid crucible with a length of 700mm.

[0049] Choose the thickness as 8mm and the outer section as 80×90mm 2 , 620mm long cuboid aluminum oxide down-leading crucible; and choose a size of 60×30×70mm 3 Crystals of bismuth germanate were cut, ground, and cleaned for use as seeds.

[0050] Put the seed crystal and the prepared raw materials into a 700mm long platinum crucible with top and bottom openings or a plat...

Embodiment 2

[0053] Prepare 600mm long bismuth germanate crystals, the specific preparation method is as follows:

[0054] Select the ready-made bismuth germanate crystal, cut and grind it into the required size and shape, and use it as the crystal block of the growth raw material after cleaning.

[0055] Other steps of embodiment 2 are as described in embodiment 1, finally make described 600mm long bismuth germanate crystal (as image 3 ).

Embodiment 3

[0057] Prepare 600mm long bismuth germanate crystals, the specific preparation method is as follows:

[0058] Control the temperature of the heating element of the furnace structure system at about 1280°C, and control the temperature of the heating element of the auxiliary heating system at about 480°C, so that the temperature field of the entire device is most suitable for the growth of crystals, and control the temperature of the alumina-leading crucible The vertical drop rate was 1.0 mm / hour and the temperature gradient at the crystal growth interface was 40 Kelvin / centimeter (K / cm).

[0059] Other steps of embodiment 3 are as described in embodiment 1 or 2, finally make described wide plate shape bismuth germanate crystal (such as image 3 ).

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Abstract

The invention provides a device and a method of growing 500-1000mm long bismuth germanate crystals by descent method. The device of growing bismuth germanate crystals includes a furnace structure system and an auxiliary heating system. According to the invention, by means of the furnace structure system and the auxiliary heating system, the temperature in the corresponding gradient region and auxiliary heating region of the crystal growth device is simultaneously controlled and regulated to insure that the whole growth device is provided with the best temperature field. According to the invention, the height of the high temperature region of the growth device and the height of the auxiliary heating system can be regulated by a ratio of 1:1 according to the length of the grown crystals, in addition, a long-size platinum crucible and alumina lead-down crucible are designed, a suitable temperature gradient and descent speed are obtained, and long-size and high-quality bismuth germanate scintillation crystals are prepared efficiently.

Description

technical field [0001] The invention belongs to the technical field of crystal growth, and in particular relates to a device and method for growing 500-1000mm long bismuth germanate crystals by a descent method. technical background [0002] Inorganic scintillation crystals are a class of light-functional crystal materials that can detect various microscopic particles or rays in the fields of nuclear physics and particle physics. It is the core material of high-tech devices and equipment in nuclear physics, high-energy physics, space physics, nuclear medical imaging, industrial non-destructive testing, homeland security, environmental testing and other application fields, and belongs to high-tech materials. Materials are the basis and breakthrough of high technology, one generation of materials and one generation of technology, which is most prominently reflected in the aspect of inorganic scintillation crystal materials. [0003] Bismuth germanate (BGO) crystal is a scinti...

Claims

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Application Information

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IPC IPC(8): C30B11/00C30B29/32
Inventor 王绍华倪海洪周里华陈俊锋刘光煜赵鹏袁兰英周学农张健宋桂兰齐雪君李赟陆裕贵杜勇李文朋李敏徐力孙世允刘训龙
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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