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

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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