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Method for synthesizing ceramic scintillator powder Gd2O2S:Pr

A synthesis method and scintillator technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as uneven particle size distribution, decreased luminescent performance, particle crystal shape damage, etc., to achieve improved structure and performance, fast heating speed, The effect of short heating time

Inactive Publication Date: 2009-03-04
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the high-temperature solid-phase method are high synthesis temperature and long time; the particle size distribution is uneven and easy to agglomerate, and it needs to be pulverized to reduce the particle size, thereby destroying the crystal shape of the particles and resulting in a decrease in luminescent performance

Method used

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  • Method for synthesizing ceramic scintillator powder Gd2O2S:Pr
  • Method for synthesizing ceramic scintillator powder Gd2O2S:Pr

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 1.813g (0.005mol) Gd 2 o 3 , 0.530g (0.005mol) Na 2 CO 3 and 0.480g (0.015mol) S, the molar ratio of the three is 1:1:3, and the number of moles added is Gd 2 o 3 1% (0.051g) of Pr 6 o 11 As an activator; fully grind and mix the above raw materials in a mortar, put them into a small corundum crucible, compact and cover them, put them into a large crucible, and fill the gap between the two crucibles with carbon particles as a microwave absorber; put the crucible In a microwave oven, the frequency is 2.45 GHz, the power is adjusted to a low level, and the time is 20 minutes. After cooling, the synthesized product is taken out.

Embodiment 2

[0018] Weigh 3.626g (0.010mol) Gd 2 o 3 , 1.060g (0.010mol) Na 2 CO 3 and 0.640g (0.020mol) S, the molar ratio of the three is 1:1:2, and the number of moles added is Gd 2 o 3 The amount of 2% (0.204g) of Pr 6 o 11 As an activator; fully grind and mix the above raw materials in a mortar, put them into a small corundum crucible, compact and cover them, put them into a large crucible, and fill the gap between the two crucibles with carbon particles as a microwave absorber; put the crucible In a microwave oven, the frequency is 2.45 GHz, the power is adjusted to mid-range, and the time is 30 minutes. After cooling, the synthesized product is taken out.

Embodiment 3

[0020] Weigh 5.439g (0.015mol) Gd 2 o 3 , 1.590g (0.015mol) Na 2 CO 3 and 0.480g (0.015mol) S, the molar ratio of the three is 1:1:1, and the number of moles added is Gd 2 o 3 The amount of 3% (0.460g) of Pr 6 o 11 As an activator; fully grind and mix the above raw materials in a mortar, put them into a small corundum crucible, compact and cover them, put them into a large crucible, and fill the gap between the two crucibles with carbon particles as a microwave absorber; put the crucible In a microwave oven, the frequency is 2.45 GHz, the power is adjusted to a medium-to-high range, and the time is 40 minutes. After cooling, the synthesized product is taken out.

[0021] figure 1 It is the ceramic scintillator powder Gd synthesized in Example 1 2 o 2 XRD spectrum of S:Pr. from figure 1 It can be seen that the resulting Gd 2 o 2 S: Pr powder is polycrystalline.

[0022] figure 2 It is the Gd synthesized in Examples 1, 2, and 3 2 o 2 S: Emission spectra of Pr p...

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Abstract

The invention discloses a synthesizing method of ceramics twinkling powder of Gd2O2S:Pr. Gd2O3, Na2CO3 and S are weighed according to a mol ratio of 1:1:1 to 3; Pr6O11 is added as an activator and the adding amount of the Pr6O11 is 1 to 3 percent of the mole number of the La2O3; besides, sodium dodecyl sulfate is added into a surface modifier and the adding amount of the sodium dodecyl sulfate is 5 to 20 percent of the mole number of the Gd2O3; then the mixture is fully grinded and mixed to be uniform in a mortar and then is arranged in a small corundum crucible; after the cover of the small corundum crucible is covered for compacting, the small corundum crucible is arranged in a large corundum crucible; carbon grains are filled in the clearance of the two corundum crucibles; the corundum crucible is arranged in a micro-wave oven for heating for 20 to 40 min and then a sample is obtained by taking the corundum crucible out after the corundum crucible is cooled. Being different from the traditional heating method, micro-wave heating refers to that the insides of the materials integrals heat, thus having a fast temperature rising time and a short heating time. Therefore, micro-wave synthesizing can effectively save energies; as the heating speed of the micro-wave is fast, the abnormal growing of crystal grains during the synthesizing process of the materials are avoided; the power material of Gd2O2S:Pr which has the advantages of high purity, small grain diameter and uniform granularity distribution can be synthesized in a shorter time; the product can be directly applied without grinding.

Description

technical field [0001] The invention relates to synthesis technology of inorganic powder materials, in particular to a ceramic scintillator powder Gd 2 o 2 S: Synthetic method of Pr. Background technique [0002] A scintillator is a functional material that can effectively absorb high-energy rays or particles and emit ultraviolet or visible light. Scintillators play an extremely important role in the research of high-energy physics. The discovery of new particles, the identification of particles and the measurement of their performance are all inseparable from scintillators. In addition, it also has important applications in the field of nuclear medicine. The detector made of scintillator and photomultiplier tube or photodiode is the core part of nuclear medicine imaging equipment. [0003] Rare earth scintillators have gradually become advanced functional materials that are being studied due to their unique advantages such as fast decay speed, high energy conversion effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/84
Inventor 杜平凡席珍强金达莱陈建军王耐艳祝洪良
Owner ZHEJIANG SCI-TECH UNIV
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