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Method for preparing scintillator of ceramics Gd2O2S: Pr, Ce, F

A gd2o2s system technology, applied in the field of Gd2O2S-based ceramic scintillator preparation, can solve the problems of unfavorable preparation of high-performance ceramic scintillator, complicated wet chemical precipitation process, and unfavorable mass production, etc. The effect of short time and high powder purity

Active Publication Date: 2007-05-09
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are two methods abroad for the preparation of Gd 2 o 2 S: Pr, Ce, F powder, namely: solid phase reaction method and wet chemical precipitation method. The solid phase reaction method uses traditional resistance furnace heating, and the powder product has low purity and coarse particle size, which is not conducive to the preparation of high-performance ceramic flashing. body
The wet chemical precipitation method has complicated process, long production cycle and high cost, which is not conducive to large-scale production
However, most domestic research is on single crystal scintillators, and the development of polycrystalline ceramic scintillators is still blank.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The device used in this embodiment has mixer, microwave oven, vacuum drying oven, hot pressing sintering furnace, Al 2 o 3 Crucible, inner circle slicer.

[0017] Weigh 10molGd respectively 2 o 3 , 10molNa 2 CO 3 , 20mol sulfur, and 0.532 grams of Pr 6 o 11 , 0.0532 g CeO 2 High-purity raw materials are mixed evenly with a high-efficiency mixer, and high-purity Al 2 o 3 Inside the crucible. Then put it into a microwave oven for microwave synthesis reaction, the microwave power is 700 watts, and the reaction time is 40 minutes. Dissolve and wash the reaction by-products with dilute hydrochloric acid, filter, dry, and sieve to obtain Gd 2 o 2 S: Pr, Ce ultrafine powder. to Gd 2 o 2 Add 2.66 grams of LiF to S:Pr, Ce powder as a sintering aid, mix well, put it into a graphite mold, put it into a hot-press furnace for hot-press sintering, hot-press temperature 1200°C, pressure 40MPa, vacuum degree 10-2Pa, The heat preservation and pressure holding time is 20 ...

Embodiment 2

[0019] The present embodiment is the same as Example 1, the difference is that 10molGd is weighed respectively 2 o 3 , 10molNa 2 CO 3 , 25mol sulfur, and 5.32 grams of Pr 6 o 11 , 0.532 g CeO 2 High-purity raw materials, microwave power of 2000 watts, reaction time of 20 minutes for microwave synthesis. to Gd 2 o 2 S: 10.64 g of LiF was added to the Pr and Ce powders as a sintering aid, the hot pressing temperature was 1400 ° C, the pressure was 70 MPa, and the vacuum degree was 8 × 10 -2 Pa, the holding time of heat preservation and pressure is 60 minutes, and the relative density of 99.8%, single-phase Gd can be obtained 2 o 2 S: Pr, Ce, F ceramics. The light transmittance of a 1 mm thick ceramic sheet is 34%.

Embodiment 3

[0021] The present embodiment is the same as Example 1, the difference is that 10molGd is weighed respectively 2 o 3 , 10molNa 2 CO 3 , 50mol sulfur, and 26.6 grams of Pr 6 o 11 , 5.32 g CeO 2 High-purity raw materials, microwave power 4000 watts, reaction time is 10 minutes for microwave synthesis, to Gd 2 o 2 S:Pr, Ce powder was added 26.6 g LiF as a sintering aid, the hot pressing temperature was 1500 °C, the pressure was 80 MPa, and the vacuum degree was 10 -3 Pa, the holding time of heat preservation and pressure is 120 minutes, and the relative density of 99.9%, single-phase Gd can be obtained 2 o 2S: Pr, Ce, F ceramics. The light transmittance of a 1 mm thick ceramic sheet is 32%.

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Abstract

This invention discloses a method for preparing Gd2O2S: Pr, Ce, F ceramic scintillator. The method comprises: uniformly mixing Gd2O3, S, Na2CO3, Pr6O11 and CeO2 at a mol ratio of 1:1:(2-1):1:5, synthesizing at a microwave power of 700-4000 W for 10-40 min, washing with acid, filtering, drying and sieving to obtain Gd2O2S:Pr, Ce powder, adding 0.05-0.5 wt.% of LiF as the sintering aid, uniformly mixing, and hot-pressing sintering under vacuum. The method has such advantages as simple process, short period, high product performance, low energy consumption, and no pollution.

Description

technical field [0001] The invention relates to the field of preparation of a sulfur oxide functional ceramic material, in particular to a Gd 2 o 2 A method for preparing an S-based ceramic scintillator. Background technique [0002] Scintillation crystals are key materials for manufacturing radiation sensors and detectors, and are widely used in nuclear medicine diagnostic CT, industrial CT, safety inspection and other fields. At present, single crystal scintillators are widely used, such as CsI:TI, CdWO 4 etc., but they have disadvantages such as poor imaging performance and poor stability in the preparation process (easy to absorb moisture), difficulty in growing large-size single crystals, easy cleavage during optical processing, and high manufacturing costs. The preparation and processing of highly dense transparent or translucent, uniformly doped polycrystalline ceramic scintillators can greatly reduce the cost, but its imaging performance is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C04B35/65
Inventor 尹邦跃张东勋
Owner CHINA INSTITUTE OF ATOMIC ENERGY