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Cerium-doped rare earth borate scintillating crystal and Bridgman preparation method thereof

A scintillation crystal and borate technology, applied in the field of crystals, can solve the problems of easy residual Ce, difficult solid-phase reaction, quenching luminescence, etc., and achieve the effects of optimizing detection performance, avoiding overflow, and avoiding cracking.

Inactive Publication Date: 2013-01-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the solid-phase reaction is difficult to complete, and Ce is easy to remain. 4+ and then quench the Ce 3+ Shine possible

Method used

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  • Cerium-doped rare earth borate scintillating crystal and Bridgman preparation method thereof
  • Cerium-doped rare earth borate scintillating crystal and Bridgman preparation method thereof
  • Cerium-doped rare earth borate scintillating crystal and Bridgman preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Li 6 Gd 0.995 Ce 0.005 (BO 3 ) 3 Crystal preparation, specific preparation method is as follows:

[0056] The initial raw material composition is: the high-purity raw material Li with a purity of 99.99% 2 CO 3 、Gd 2 o 3 、H 3 BO 3 and CeO 2 Press Li 6 Gd 0.995 Ce 0.005 (BO 3 ) 3 Accurately weigh and mix the stoichiometric ratio, and press it into φ32×40mm under the pressure of 10MPa 3 The block was pre-sintered at 650 °C for 10 hours to obtain Li by solid-state reaction 6 Gd 0.995 Ce 0.005 (BO 3 ) 3 polycrystalline material;

[0057] A conical crucible with a maximum opening diameter of φ35mm and a total length of 250mm is made of a single-layer platinum sheet with a thickness of 0.15mm;

[0058] Set the size in the direction of ⊥(001) to φ8×20mm 3 Lithium gadolinium borate crystals are used as seed crystals;

[0059] A platinum crucible with a seed crystal on the bottom and a fully sintered lithium gadolinium borate polycrystalline block on th...

Embodiment 2

[0069] LiOH with a purity of 99.99%, Gd 2 o 3 , Y 2 o 3 , Ce(NO 3 ) 3 and B 2 o 3 Press Li for the initial raw material 6 Gd 0.7 Y 0.295 Ce 0.005 (BO 3 ) 3 The stoichiometric ratio is accurately weighed, mixed, and pressed into φ32×40mm under a pressure of 15MPa 3 The block was pre-sintered at 700 °C for 15 hours to obtain Li by solid-state reaction 6 Gd 0.7 Y 0.295 Ce 0.005 (BO 3 ) 3 polycrystalline material.

[0070] The furnace temperature is controlled at 930°C, the descending speed is 1.5mm / hour, and the remaining conditions are as described in Example 1, and 6 Li can be grown. 6 Gd 0.7 Y 0.295 Ce 0.005 (BO 3 ) 3 crystals.

Embodiment 3

[0072] The high-purity raw material Li with a purity of 99.99% 2 CO 3 , Y 2 o 3 , Ce(NO 3 ) 3 and H 3 BO 3 Press Li 6 Y 0.995 Ce 0.005 (BO 3 ) 3 Accurately weigh and mix the stoichiometric ratio, and press it into φ32×40mm under the pressure of 10MPa 3 The block was pre-sintered at a temperature of 710 °C for 12 hours to obtain Li by solid-state reaction 6 Y 0.995 Ce 0.005 (BO 3 ) 3 polycrystalline material.

[0073] Control the furnace temperature to 950°C, and the descending speed is 2.7 mm / hour, and the rest follow the process conditions described in Example 1, and 10 Li cells can be grown. 6 Y 0.995 Ce 0.005 (BO 3 ) 3 crystals.

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Abstract

The invention relates to the field of crystals, in particular to a cerium-doped rare earth borate scintillating crystal and a Bridgman preparation method thereof. The chemical formula of the cerium-doped rare earth borate scintillating crystal is Li6Gd1-x-yYxCey(BO3)3, wherein the numeric range of x is from 0 to 0.9999, and the numeric range of y is from 0.0001 to 0.1. In the cerium-doped rare earth borate scintillating crystal of the invention, by partially replacing a Gd element with an element Y with approximate electronegativity and relatively smaller atomic number, the detection propertyof the gadolinium lithium borate crystal on neutrons is optimized and the raw material cost of crystal preparation is reduced. The Bridgman preparation method has the characteristics of simple processing equipment, low energy consumption, high production efficiency, low cost and the like, is convenient to operate and can realize industrial production.

Description

technical field [0001] The invention relates to the field of crystals, in particular to a cerium-doped rare earth borate scintillation crystal and a preparation method thereof by a crucible drop method. Background technique [0002] Neutron is an almost uncharged elementary particle. It has strong penetrating power, can identify light elements, especially elements such as hydrogen and lithium, distinguish neighboring elements, realize isotope replacement, detect atomic magnetic moment, and measure the dynamics inside materials. Features and other unique advantages. Effective and accurate detection of neutrons can realize the monitoring and research of the atomic reactor chain nuclear reaction process. It is a necessary means for military inspection and detection of the location and quantity of nuclear warheads of both the enemy and the enemy. The effective detection of low-density hidden objects such as neutrons is an important weapon in the fight against terrorism, smuggli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B11/00
Inventor 丁栋舟杨帆任国浩潘尚可张卫东陈晓峰
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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