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Composite crucible, preparation method thereof and method for bismuth germanate crystal growth using the crucible

A composite crucible, bismuth germanate technology, applied in the directions of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of complex platinum processing and purification process, increase the production cost of BGO single crystal, etc., to save the use of platinum and reduce costs. Effect

Inactive Publication Date: 2014-07-23
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the industry, the crucible used for BGO single crystal growth is basically made of pure platinum, so a large amount of platinum is needed in the production of this crucible, and the processing and purification process of platinum is complicated and there is a loss of 5‰~2%, which greatly improves the Production cost of BGO single crystal

Method used

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  • Composite crucible, preparation method thereof and method for bismuth germanate crystal growth using the crucible

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preparation example Construction

[0022] The preparation method of the composite crucible according to the present invention comprises the steps of: dissolving platinum powder in aqua regia to form a solution, spraying the solution evenly on the inner surface of the ceramic crucible body 1 of the ceramic crucible, and spraying the sprayed ceramic crucible in a heating furnace Body 1 is heated up to 150-250°C, then kept for 2-6 hours, and finally cooled in air. The heating temperature is preferably 170 to 210°C, more preferably 190°C.

[0023] In the preparation method of the composite crucible according to the present invention, the spraying can be performed by a spray gun.

[0024] Next, the method for growing bismuth germanate crystals according to the third aspect of the present invention will be described.

[0025] According to the method for growing bismuth germanate crystals of the present invention, it adopts the composite crucible according to the first aspect of the present invention, and the method ...

Embodiment 1

[0032] According to the ratio of 120g of platinum powder with a purity of 99.99% dissolved in 1.2L of aqua regia to form a solution, the solution is evenly sprayed on the inner surface of the ceramic crucible body 1 (alumina material) of the ceramic crucible by using a spraying tool-spray gun, Heat the sprayed ceramic crucible body 1 in the heating furnace, raise the temperature to 150°C, then keep it warm for 6 hours, and finally cool it by air cooling. Finally, the thickness of the platinum film on the inner surface of the alumina ceramic crucible body 1 is 0.12mm;

[0033] 10kg of 5N bismuth trioxide and 5N germanium oxide powder are batched according to a molar ratio of 2:3, and the batch is melt-cast into 4 bismuth germanate polycrystalline rods;

[0034] The bismuth germanate polycrystalline rods are respectively loaded into the ceramic crucible bodies of 4 aluminum oxide-platinum composite crucibles with a bismuth germanate seed crystal coated with a platinum film thickn...

Embodiment 2

[0039] According to the ratio of 210g of platinum powder with a purity of 99.99% dissolved in 2.52L of aqua regia to form a solution, the solution is evenly sprayed on the inner surface of the ceramic crucible body 1 (BN material) of the ceramic crucible with a spraying tool-spray gun, and heated The sprayed ceramic crucible body 1 is heated in the furnace, the temperature is raised to 200°C, and then kept for 4 hours, and finally air-cooled, and finally the thickness of the platinum film on the inner surface of the ceramic crucible body 1 is 0.20mm;

[0040] The 5N bismuth trioxide and 5N germanium oxide powder of 15kg are batched according to the molar ratio of 2:3, and the batching is melt-casted into 5 bismuth germanate polycrystalline rods;

[0041] The bismuth germanate polycrystalline rods were respectively loaded into the ceramic crucible bodies of five BN-platinum composite crucibles with a BGO seed crystal inner coating thickness of 0.20mm platinum film, and then the ...

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Abstract

The present invention provides a composite crucible, a preparation method thereof and a method for bismuth germanate crystal growth using the crucible. The composite crucible includes a platinum film placed on the inner surface of a ceramic crucible. The bismuth germanate crystal growth method comprises: adding bismuth germanate polycrystalline material into the ceramic crucible seeded with bismuth germanate crystal seeds; then adding high temperature adhesive into the matching gap between the ceramic crucible and a ceramic cap and sealing; putting the crucible into a single-crystal furnace, heating the single-crystal furnace from room temperature to a first temperature above the melting point of bismuth germanate but below the melting point of platinum at a first temperature raising rate, and keeping the first temperature for a first period of time; moving down the composite crucible at a predefined downward movementrate so as to grow single crystals, meanwhile heating the single-crystal furnace from the first temperature at a second temperature raising rate lower than the first temperature raising rate to a second temperature below the melting point of platinum, keeping the second temperature for a second period of time in which the composite crucible is moving down at the predefined downward movement rate until the single crystals completely grow up; and blowing off and cooling down the furnace. The crucible and the methods reduce the use of platinum and costs.

Description

technical field [0001] The invention relates to a crucible and a method for growing crystals, in particular to a composite crucible, a preparation method thereof and a method for growing bismuth germanate crystals using the crucible. Background technique [0002] Bismuth germanate crystal, the chemical formula is Bi 4 Ge 3 o 12 , referred to as BGO, is a multifunctional scintillation crystal material with good performance. It has a strong ability to block rays, high scintillation efficiency, and has the advantages of not being easy to deliquescence and good machining performance, so it is widely used in elementary particles, high-energy physics, nuclear physics, space physics, nuclear medicine, geological exploration, etc. field. [0003] At present, in the industry, the crucible used for BGO single crystal growth is basically made of pure platinum, so a large amount of platinum is needed in the production of this crucible, and the processing and purification process of ...

Claims

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Application Information

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IPC IPC(8): C30B11/00C30B29/32
Inventor 胡智向吕铁铮朱刘卢金生
Owner FIRST RARE MATERIALS CO LTD
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