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Method for developing crystal of yttrium aluminate with cerium doped

A growth method, the technology of yttrium aluminate, which is applied in the growth field of cerium-doped yttrium aluminate crystal, can solve problems such as lattice distortion and reduction of crystal scintillation performance

Inactive Publication Date: 2005-01-12
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But since Ce 3+ The radius of is 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 it cannot be doped at a higher concentration. miscellaneous

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example x=0.1%, y=0.1% are selected. So put Y 2 o 3 , Al 2 o 3 , CeO 2 , Lu 2 o 3 The high-purity raw materials are weighed according to the molar ratio of 0.998:1:0.002:0.001, and the total weight is 1Kg. After mechanically mixing evenly, use a press machine at 20kg / cm 2 Pressed into blocks under high pressure, and then sintered at 1000 ° C for 10 hours, vacuumed and filled with high-purity nitrogen in the furnace, heated and melted to prepare for growth. The pulling speed was 1 mm / h, and the rotation speed was 10 rpm. After growing the crystal, it was slowly lowered to room temperature, and the crystal was taken out.

[0021] The test results show that the crystal is colorless, transparent and complete, with good quality. no co-doped Lu 2 o 3 The same concentration of cerium-doped yttrium aluminate scintillation crystal, the dislocation density is reduced, and its dislocation density is 10 2 -10 4 / cm 2 , flicker light output performance increas...

Embodiment 2

[0023] In this example x=0.1%, y=0.3% are selected. So put Y 2 o 3 , Al 2 o 3 , CeO 2 , Lu 2 o 3 The high-purity raw materials are weighed according to the molar ratio of 0.996:1:0.002:0.003, and the total weight is 1Kg. After mechanically mixing evenly, use a press machine at 30kg / cm 2 Pressed into blocks under high pressure and then sintered at 1200 ° C for 12 hours, vacuumed and filled with high-purity nitrogen in the furnace, heated and melted to prepare for growth. The pulling speed was 1.5 mm / h, and the rotation speed was 12 rpm. After growing the crystal, it was slowly lowered to room temperature, and the crystal was taken out.

[0024] The test results show that the crystal is colorless, transparent and complete, with good quality. no co-doped Lu 2 o 3 The same concentration of cerium-doped yttrium aluminate scintillation crystal, the dislocation density is reduced, and its dislocation density is 10 2 -10 4 / cm 2 , flicker light output performance increa...

Embodiment 3

[0026] In this example x=0.1%, y=0.2% are selected. So put Y 2 o 3 , Al 2 o 3 , CeO 2 , Lu 2 o 3 The high-purity raw materials are weighed according to the molar ratio of 0.997:1:0.002:0.002, and the total weight is 1Kg. After mechanically mixing evenly, use a press machine at 35kg / cm 2 Pressed into blocks under high pressure and then sintered at 1400 ° C for 16 hours, vacuumed and filled with high-purity nitrogen in the furnace, heated and melted to 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.

[0027] The test results show that the crystal is colorless, transparent and complete, with good quality. no co-doped Lu 2 o 3 The same concentration of cerium-doped yttrium aluminate scintillation crystal, the dislocation density is reduced, and its dislocation density is 10 2 -10 4 / cm 2 , flicker light output performance increase...

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Abstract

A doped Ce yttrium aluminic acid crystal growing method characterizes in doping CeO2 and Lu2O3 in the raw material formula at the same time and is determined by the following formula: Al2O3+(1-X-Y) Y2O3+2XCeO2+YLu2O3=2Y1-x-y Cex Luy AlO3 + x / 2O2, in which X is greater or equal to 0.1% but less than or equal to 2.0%, y is greater than or equal to x but less than or equal to 3x. The crystal is grown in an IF inducing furnace with a pulling method. The dislocation density is reduced to 100-10000 / sq.cm, its scintillation output performance increases 5%-10%.

Description

technical field [0001] The invention relates to yttrium aluminate crystals, in particular to a method for growing cerium-doped yttrium aluminate crystals. Background technique [0002] Ce 3+ Ion-doped yttrium aluminate single crystals are a class of high-temperature inorganic scintillation materials with excellent performance. They are widely used in imaging nuclear medicine (PET) diagnosis, industrial online non-destructive testing, oil well survey, safety inspection and high-energy particle detection. background. [0003] In 1973, American scientist M.J.Weber first reported Ce:YAlO 3 Optical spectral properties of crystals (M.J.Weber, "Optical spectrum of Ce 3+ and Ce 3+ -sensitized for Luore Luence in YAlO 3 "Published in J.Appl.Phys., No. 7, Volume 44, Page 3025-3028 in 1973), and then Japanese scientist Takeda et al. reported the excellent scintillation characteristics of Ce:YAP materials (Takeda et al. published in J . Electrochem. Soc., No. 127, 1980 p. 438). ...

Claims

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Application Information

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IPC IPC(8): C30B15/04C30B29/24
Inventor 夏长泰徐军曾雄辉赵广军张连翰何晓明庞辉勇介明印李抒智
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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