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Lutetium-aluminum garnet scintillation ceramic in non-stoichiometric ratio and preparation method for ceramic

A non-stoichiometric ratio, lutetium aluminum garnet technology, applied in the field of preparation of transparent scintillation ceramics, can solve problems such as performance defects, and achieve the effect of huge application potential

Active Publication Date: 2016-03-23
中科西卡思(苏州)科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to overcome the defects of the existing garnet-type scintillation transparent ceramics in the preparation method and the performance caused by the preparation method. The present invention provides a lutetium aluminum garnet scintillation ceramic and its preparation method

Method used

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  • Lutetium-aluminum garnet scintillation ceramic in non-stoichiometric ratio and preparation method for ceramic
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  • Lutetium-aluminum garnet scintillation ceramic in non-stoichiometric ratio and preparation method for ceramic

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preparation example Construction

[0036] The method for preparing lutetium aluminum garnet scintillation ceramics can be prepared by solid phase reaction method, according to the stoichiometric ratio [Lu (1-x) RE x ] 3 Al 5 o 12 Carry out ingredient weighing Al 2 o 3 and RE high-purity oxides, while Lu 2 o 3 The powder needs to weigh (3 / 2)(1-x)(1+y)mol. The oxide powder raw materials are uniformly mixed by ball milling, absolute ethanol is used as the ball milling medium, the ball milling speed is 60-150rmp / min, and the ball milling time is 5-20h.

[0037] The method for preparing lutetium-aluminum-garnet scintillation ceramics can be prepared by liquid-phase method, directly using liquid-phase synthesis such as precipitation method or sol-gel combustion synthesis to obtain a component of [Lu (1-x)(1+y) RE x ] 3 Al 5 o 12 the initial powder.

[0038] The method for preparing lutetium aluminum garnet scintillation ceramics is prepared into a green body by dry pressing, cold isostatic pressing, coll...

Embodiment 1

[0058] Embodiment 1: x=0.005, y=0.03, 0.5at% Ce: (Lu 0.995×1.03 ) 3 Al 5 o 12

[0059] Using commercially available high-purity Lu 2 o 3 (99.99%), Al 2 o 3 (99.99%) and CeO 2 (99.99%) powder as raw material, according to (Lu 0.995×1.03 Ce 0.005 ) 3 al 5 o 12 The chemical formula is weighed, using absolute ethanol as the ball milling medium, the ratio of the sum of the mass of the above-mentioned oxides to the amount of ethanol added is 60g:25ml, and ball milling on a high-energy ball mill for 10-20h at a ball milling speed of 60-120rmp / min. After the ball-milled slurry is dried and sieved, the ceramic green body is obtained by dry pressing and cold isostatic pressing in sequence. The green body is sintered in a vacuum furnace with a sintering temperature range of 1700-1850°C and a holding time of 5-50 Hour. The ceramic samples obtained by vacuum sintering were annealed in an air atmosphere at 1200°C-1600°C for 5-50h, then mechanically thinned and polished to obtain...

Embodiment 2

[0067] Embodiment 2: x=0.003, y=0.02, 0.3at%Ce: (Lu 0.997×1.02 ) 3 al 5 o 12

[0068] Using commercially available high-purity Lu 2 o 3 (99.99%), Al 2 o 3 (99.99%) and CeO 2 (99.99%) powder as raw material, according to (Lu 0.997×1.02 Ce 0.003 ) 3 al 5 o 12 The chemical formula is weighed, using absolute ethanol as the ball milling medium, the ratio of the sum of the mass of the above-mentioned oxides to the amount of ethanol added is 60g:25ml, and ball milling on a high-energy ball mill for 10-20h at a ball milling speed of 60-120rmp / min. After the ball-milled slurry is dried and sieved, the ceramic green body is obtained by dry pressing and cold isostatic pressing in sequence. The green body is sintered in a vacuum furnace with a sintering temperature range of 1700-1900°C and a holding time of 5-50 Hour. The ceramic samples obtained by vacuum sintering were annealed in the mixture of oxygen and air for 5-50 hours, the annealing temperature range was 1200°C-1600...

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Abstract

The invention relates to a lutetium-aluminum garnet scintillation ceramic in a non-stoichiometric ratio and a preparation method for ceramic. The general formula of the lutetium-aluminum garnet scintillation ceramic is [Lu(1-x)(1+y)REx]3Al5O12, wherein RE is one of rare earth activated ions Ce, Pr, Eu, Nd, Sm, Gd, Ho, Yb, Tm, Dy and Er; x is greater than or less than or equal to 0.05, and y is greater than or less than or equal to 0.04.

Description

technical field [0001] The invention belongs to the technical field of preparation of transparent scintillating ceramics, in particular to a lutetium aluminum garnet scintillating ceramic and a preparation method thereof. Background technique [0002] Scintillator is a functional material that can effectively absorb high-energy rays or particles (X, γ photons, accelerated charged particles, neutrons) and convert them into ultraviolet or visible light. The scintillation detector composed of it as the core device is widely used In the fields of high-energy physics and space research, imaging nuclear medicine (XCT and PET), and the rapidly developing industrial inspection and safety inspection. [0003] At present, the scintillator for industrial application is mainly single crystal, but the growth conditions of single crystal are harsh, the requirements for equipment are high, and the crystal growth rate is slow, which makes its production cost high. In addition, limited by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/622
Inventor 刘书萍冯锡琪王伟石云吴乐翔寇华敏曾燕萍李江潘裕柏郭景坤
Owner 中科西卡思(苏州)科技发展有限公司
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