Process for growing cerium-doped LYSO scintillating crystals by using molybdenum crucible

A technology of yttrium lutetium silicate and scintillation crystal, which is applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., to achieve the effect of simple growth process and reduced cost

Active Publication Date: 2015-01-21
成都东骏激光股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to: address the above-mentioned problems, provide a process for growing scintillation crystals of cerium-doped yttrium-lutetium silicate using a molybdenum crucible, and overcome the inability to use molybdenum crucibles for growth of cerium-doped yttrium-lutetium silicate scintillation crystals in the current process On the premise of ensuring the quality of crystal growth, reduce the production cost of cerium-doped yttrium-lutetium silicate scintillation crystal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The process of growing cerium-doped yttrium-lutetium silicate scintillation crystals in the molybdenum crucible of this embodiment comprises the following steps:

[0038] (a) Use the LYSO solid-phase reaction material prepared by stoichiometric ratio with 5% Y and 0.5% Ce, and put the solid-phase reaction material into the molybdenum crucible;

[0039] (b) Put the crucible in a vacuum furnace and evacuate until the pressure in the furnace is 10Pa;

[0040] (c) The furnace is filled with flowing Ar and H 2 Mix gas and maintain pressure at 20kPa, Ar and H 2 The volume ratio is 1:1;

[0041] (d) When the temperature in the furnace rises to about 1400°C, re-evacuate until the pressure in the furnace is 10Pa, and then fill the furnace with flowing Ar and H 2 Mix gas and maintain pressure at 20kPa, Ar and H 2 The volume ratio is 1:1;

[0042] (e) Continue to heat up in the furnace until the solid-phase reaction material melts, and grow crystals after reaching normal cond...

Embodiment 2

[0046] The process of growing cerium-doped yttrium-lutetium silicate scintillation crystals in the molybdenum crucible of this embodiment comprises the following steps:

[0047] (a) Use the LYSO solid-phase reaction material prepared by stoichiometric ratio with 10% Y and 0.3% Ce, and put the solid-phase reaction material into the molybdenum crucible;

[0048] (b) Put the crucible in a vacuum furnace and evacuate until the pressure in the furnace is 5Pa;

[0049] (c) The furnace is filled with flowing Ar and H 2Mix gas and maintain pressure at 50kPa, Ar and H 2 The volume ratio is 5:1;

[0050] (d) When the temperature in the furnace rises to about 800°C, re-evacuate until the pressure in the furnace is 5Pa, and then fill the furnace with flowing Ar and H 2 Mix gas and maintain pressure at 50kPa, Ar and H 2 The volume ratio is 5:1;

[0051] (e) Continue to heat up in the furnace until the solid-phase reaction material melts, and grow crystals after reaching normal conditi...

Embodiment 3

[0055] The process of growing cerium-doped yttrium-lutetium silicate scintillation crystals in the molybdenum crucible of this embodiment comprises the following steps:

[0056] (a) Use the LYSO solid-phase reaction material prepared by stoichiometric ratio with 10% Y and 0.3% Ce, and put the solid-phase reaction material into the molybdenum crucible;

[0057] (b) Put the crucible in a vacuum furnace and evacuate until the pressure in the furnace is 3Pa;

[0058] (c) The furnace is filled with flowing Ar and H 2 Mix gas and maintain pressure at 100kPa, Ar and H 2 The volume ratio is 10:1;

[0059] (d) When the temperature in the furnace rises to about 1900°C, re-evacuate until the pressure in the furnace is 3Pa, and then fill the furnace with flowing Ar and H 2 Mix gas and maintain pressure at 100kPa, Ar and H 2 The volume ratio is 10:1;

[0060] (e) Continue to heat up in the furnace until the solid-phase reaction material melts, and grow crystals after reaching normal c...

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Abstract

The invention discloses a process for growing cerium-doped LYSO scintillating crystals by using a molybdenum crucible, which belongs to the technical field of scintillating crystal preparation. The process for growing scintillating crystals comprises the following steps: (a) putting a solid-phase reaction material into the molybdenum crucible; (b) putting the crucible into a vacuum furnace, and vacuumizing the vacuum furnace until the pressure of the inside of the furnace is less than or equal to 10 Pa; (c) filling flowing weak reductive protective gas in the furnace; (d) heating the inside of the furnace, and carrying out at least primary air exchange in the process of heating, wherein the air exchange includes vacuumizing the inside of the furnace until the pressure is less than or equal to 10 Pa, and then filling flowing weak reductive protective gas in the furnace again; and (e) further heating the inside of the furnace until the solid-phase reaction material is melted, and carrying out crystal growth. The process for growing LYSO scintillating crystals overcomes technical problems; and by using the process, the molybdenum crucible both can resist oxidation and erosion of molten LYSO raw materials, then high-quality LYSO scintillating crystals grow, and therefore, the production cost is greatly reduced, and the process is relatively simple and easy to control.

Description

technical field [0001] The invention relates to a process for growing scintillation crystals, in particular to a process for growing scintillation crystals using a molybdenum crucible to grow cerium-doped yttrium-lutetium silicate scintillation crystals, and belongs to the technical field of scintillation crystal preparation. Background technique [0002] Cerium-doped yttrium lutetium silicate (LYSO:Ce) scintillation crystal (LYSO for short) is an urgently needed scintillation crystal in the market. It is the main candidate for the new generation of international electromagnetic calorimeter project Mu2e (SuperB). The best performing detector. [0003] The main component of LYSO crystal is Lu 2 o 3 , Y 2 o 3 , SiO 2 , CeO 2 , the purity of raw materials required to grow crystals reaches 4N level, and 4N lutetium oxide is expensive, and it is the main quantity of crystals (generally accounting for more than 80% of the total weight of crystals), and the crucibles used for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/34C30B11/00
CPCC30B11/00C30B29/34
Inventor 周世斌沈定中
Owner 成都东骏激光股份有限公司
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