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Rare earth doped magnesium tantalate series scintillation luminescent material and preparation method and application thereof

A rare-earth-doped, flashing and luminous technology, applied in the field of X-ray detection, to achieve the effect of safe operation, not easy to deliquescence, and easy control of conditions

Active Publication Date: 2021-10-01
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the doping of rare earth ions in Mg4Ta2O9 materials has rarely been reported.

Method used

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  • Rare earth doped magnesium tantalate series scintillation luminescent material and preparation method and application thereof
  • Rare earth doped magnesium tantalate series scintillation luminescent material and preparation method and application thereof
  • Rare earth doped magnesium tantalate series scintillation luminescent material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0037] A preparation method of rare earth (Sc) doped magnesium tantalate series scintillation light-emitting materials, comprising the following steps:

[0038] Weigh MgO, Ta respectively according to the stoichiometric ratio 2 o 5 , Sc 2 o 3 , grind the above raw materials in an agate mortar, add absolute ethanol as a dispersant, put them into a corundum crucible after grinding evenly, pre-fire in an air atmosphere at 1250 ° C for 3 hours, cool naturally to room temperature, and pour out the raw materials Continue to fully grind in an agate mortar, then put it into a corundum crucible, sinter in an air atmosphere at 1300°C for 6 hours, cool naturally to room temperature, and grind evenly to finally get the product.

[0039] The X-ray diffraction peaks of the product are as figure 1 Medium Mg 4 Ta 2 o 9 : 0.25at%Sc (at% means atomic percentage) as shown in the curve. It can be seen from the curve in the figure that all the diffraction peaks correspond to the standard d...

Embodiment 2

[0041] A preparation method of rare earth (Lu) doped magnesium tantalate series scintillation light-emitting materials, comprising the following steps:

[0042] Weigh MgO, Ta respectively according to the stoichiometric ratio 2 o 5 , Lu 2 o 3 , grind the above raw materials in an agate mortar, add absolute ethanol as a dispersant, put them into a corundum crucible after grinding evenly, pre-fire in an air atmosphere at 1250 ° C for 3 hours, cool naturally to room temperature, and pour out the raw materials Continue to fully grind in an agate mortar, then put it into a corundum crucible, sinter in an air atmosphere at 1300°C for 6 hours, cool naturally to room temperature, and grind evenly to finally get the product.

[0043] The X-ray diffraction peaks of the product are as figure 1 Medium Mg 4 Ta 2 o 9 : 0.25at% Lu shown in the curve. It can be seen from the curve in the figure that all the diffraction peaks correspond to the standard diffraction peaks (PDF#38-1458). ...

Embodiment 3

[0045] A preparation method of rare earth (Yb) doped magnesium tantalate series scintillation light-emitting materials, comprising the following steps:

[0046] Weigh MgO, Ta respectively according to the stoichiometric ratio 2 o 5 , Yb 2 o 3 , grind the above raw materials in an agate mortar, add absolute ethanol as a dispersant, put them into a corundum crucible after grinding evenly, pre-fire in an air atmosphere at 1250 ° C for 3 hours, cool naturally to room temperature, and pour out the raw materials Continue to fully grind in an agate mortar, then put it into a corundum crucible, sinter in an air atmosphere at 1300°C for 6 hours, cool naturally to room temperature, and grind evenly to finally get the product.

[0047] The X-ray diffraction peaks of the product are as figure 1 Medium Mg 4 Ta 2 o 9 :0.25at%Yb curve shown. It can be seen from the curve in the figure that all the diffraction peaks correspond to the standard diffraction peaks (PDF#38-1458). Such as ...

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Abstract

The invention discloses a rare earth doped magnesium tantalate series scintillation luminescent material and a preparation method and application thereof. The chemical composition expression of the rare earth doped magnesium tantalate series scintillation luminescent material disclosed by the invention is Mg4Ta2O9:RE. The scintillation luminescent material is synthesized by adopting a high-temperature solid-phase method and stably exists in the air, and the process is safe, simple and easy to control. According to the scintillation luminescent material disclosed by the invention, under the excitation of X rays, the light yield of an obtained Mg4Ta2O9:RE sample doped with different rare earth is 13848 to 43917 ph / MeV. The light yield of a sample Mg4Ta2O9:0.25at% Gd is the highest, is 81% of that of CsI (Tl), and is 2.4 times of that of Mg4Ta2O9 (MTO for short) and CdWO4.

Description

technical field [0001] The invention relates to a rare-earth-doped magnesium tantalate series scintillating luminescent material and a preparation method and application thereof, belonging to the technical field of X-ray detection. Background technique [0002] Inorganic scintillation crystals are widely used in the fields of high-energy physics and nuclear physics, astrophysics, medical imaging, geological exploration, safety detection, and national defense. Especially for airport security inspection, customs container inspection, etc., a large number of X-ray imaging probes based on scintillation crystals are required. At present, the more mature security inspection probe materials mainly include CdWO 4 crystal, CsI(Tl) crystal, etc. wxya 4 It has good ray stopping ability and almost no afterglow, but its brightness is relatively low, and Cd is poisonous. CsI: Tl has good light yield and ray stopping ability, but its decay time is relatively long, and Tl is toxic. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67G01N23/20
CPCC09K11/7703C09K11/7718C09K11/7731C09K11/7746C09K11/7756C09K11/7761G01N23/207G01N2223/056G01N2223/07G01N2223/1016
Inventor 马云峰郭超徐家跃秦康吴金成蒋毅坚王森宇
Owner SHANGHAI INST OF TECH
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