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Growth process for cerium dosed yttrium aluminum garnet crystal

A technology of yttrium aluminum garnet and a growth method, which is applied in the field of yttrium aluminum garnet crystal, can solve the problems of doping, lattice distortion, and reduce crystal scintillation performance, so as to reduce dislocation density, improve lattice distortion, and improve scintillation. performance effect

Inactive Publication Date: 2004-12-08
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But since Ce 3+ The radius of 103.4Pm, and Y 3+ has a radius of 88Pm, so from the point of view of ionic radius matching, Ce 3+ After doping, it will cause a large lattice distortion. Undoubtedly, the generation of this lattice distortion will introduce more point defects in the crystal, thereby reducing the scintillation performance of the crystal.
and cannot be doped at a higher concentration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this example, x=0.1%, y=0.01%. So put Y 2 o 3 , Al 2 o 3 , CeO 2 , Sc 2 o 3 The high-purity raw materials are weighed according to the molar ratio of 2.9967:5:0.006:0.0003, and the total weight is 1Kg. After mechanically mixing evenly, use a press machine at 20kg / cm 2 Then, it is sintered at 1000°C for 10h, and the furnace is vacuumed and filled with high-purity nitrogen, and the temperature is raised to melt and prepare for growth: the pulling speed is 1mm / h, and the rotation speed is 10rpm. After growing the crystal, it was slowly lowered to room temperature, and the crystal was taken out. The crystals are colorless, transparent and complete, with good quality. Compared with no co-doped Sc 2 o 3 The same concentration of cerium-doped yttrium aluminum garnet scintillation crystal, the dislocation density is reduced, and the scintillation light output performance is increased by 5%-20%.

Embodiment 2

[0024] In this example x=0.1%, y=0.1%. So put Y 2 o 3 , Al 2 o 3 , CeO 2 , Sc 2 o 3 The high-purity raw materials are weighed according to the molar ratio of 2.994:5:0.006:0.003, and the total weight is 1Kg. After mechanically mixing evenly, use a press machine at 50kg / cm 2 Pressed into blocks under high pressure, and then sintered at 1650 ° C for 20 hours, vacuumed and filled with high-purity nitrogen in the furnace, heated and melted to prepare for growth. The pulling speed was 3 mm / h, and the rotation speed was 20 rpm. After growing the crystal, it was slowly lowered to room temperature, and the crystal was taken out. The crystals are colorless, transparent and complete, with good quality. Compared with no co-doped Sc 2 o 3 The same concentration of cerium-doped yttrium aluminum garnet scintillation crystal, the dislocation density is reduced, and the scintillation light output performance is increased by 5%-20%.

Embodiment 3

[0026] In this example x=0.1%, y=0.05%. So put Y 2 o 3 , Al 2 o 3 , CeO 2 , Sc 2 o 3 The high-purity raw materials are weighed according to the molar ratio of 2.9955:5:0.006:0.0015, and the total weight is 1Kg. After mechanically mixing evenly, use a press machine at 40kg / cm 2 It is pressed into blocks under high pressure and then sintered at 1300°C for 15 hours. The furnace is vacuumed and filled with high-purity nitrogen, and the temperature is raised to melt and prepare for growth. The pulling speed was 2 mm / h, and the rotation speed was 14 rpm. After growing the crystal, it was slowly lowered to room temperature, and the crystal was taken out. The crystals are colorless, transparent and complete, with good quality. Compared with no co-doped Sc 2 o 3 The same concentration of cerium-doped yttrium aluminum garnet scintillation crystal, the dislocation density is reduced, and the scintillation light output performance is increased by 5%-20%.

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Abstract

A growth process of cerium dosed Y-Al garnet crystal is carried out by dosing Sc2O3 or Lu2O3 at mol. ratio of Al2O3 : Y2O3 : CeO2+A2O3 = 5:3 (1-x-y) :6x:3y, wherein, 0.1% <= x <= 10%, 0.1x <= y<=x, A2O3 = Sc2O3 or Lu2O3. The process can reduce poor placement in crystal and increase flash of crystal by improvement of radial match between Ce and Y ions.

Description

Technical field: [0001] The invention relates to yttrium aluminum garnet crystals, in particular to a preparation method of cerium-doped yttrium aluminum garnet crystals. Background technique [0002] Ce-doped yttrium aluminum garnet (Ce 3+ :YAG) crystal has the advantages of high luminous efficiency, fast luminous attenuation, excellent thermomechanical properties, and good matching of the luminous peak wavelength with the receiving sensitive wavelength of commonly used photomultiplier tubes and silicon photodiodes. It is a fast-decaying scintillation material with excellent comprehensive performance. Ce 3+ : YAG single crystal is suitable for detecting light charged particles such as α particles, electrons and β rays, especially Ce 3+ :YAG scintillation detectors are widely used in electron microscopy, β and X-ray counting, electron and X-ray imaging screens and other fields. [0003] In 1994, Polish scholar M. Moszyński and others studied Ce 3+ : The scintillation pro...

Claims

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Application Information

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IPC IPC(8): C30B15/00C30B29/28
Inventor 曾雄辉徐军赵广军李红军何晓明庞辉勇介明印王静雅张连翰杭寅
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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