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Anhydrous cerium-doped lanthanum bromide and preparation method thereof

A technology of cerium lanthanum bromide and hydrogen bromide, which is applied in the field of deep processing of rare earth materials, can solve the problems of difficult preparation of high-purity lanthanum bromide and cerium bromide, difficulty in growing large-sized crystals, waste of energy and time, and achieve large-scale Large-scale mass production, low production cost, consistent effect of cerium content

Inactive Publication Date: 2019-03-22
厦门中烁光电科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] LaBr 3 : It is very difficult to grow large-sized Ce crystals, and the price is extremely expensive. The technical bottleneck lies in the difficulty of preparing high-purity lanthanum bromide and cerium bromide
The prepared raw materials are very susceptible to contamination by oxygen and water, and high impurity content can easily lead to quenching of luminescence
[0004] In the crystal growth preparation stage, the most common way to obtain anhydrous lanthanum bromide / cerium bromide mixture is to prepare anhydrous lanthanum bromide / cerium bromide separately, and then accurately weigh and mix them separately, but the disadvantages of this method are: 1. Uneven mixing, which leads to low performance uniformity at different positions of the single crystal; 2. In order to improve the uniformity of mixing, it is necessary to prolong the melting time, wasting energy and time; 3. Careless handling of the mixing process can easily introduce other impurities

Method used

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  • Anhydrous cerium-doped lanthanum bromide and preparation method thereof
  • Anhydrous cerium-doped lanthanum bromide and preparation method thereof

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preparation example Construction

[0015] The preparation method of the anhydrous cerium-doped lanthanum bromide of the present invention specifically includes the following steps, and the whole preparation process is carried out under protective atmosphere or vacuum conditions.

[0016] (1) A cerium source and a lanthanum source are reacted in the presence of bromide ions.

[0017] Wherein, the cerium source may be cerium acetate hydrate or cerium carbonate. Preferably, the cerium acetate hydrate is cerium acetate with 1.5 to 3 crystal waters, more preferably, the cerium acetate hydrate is Ce(CH 3 COO) 3 1.5H 2 O, Ce(CH 3 COO) 3 2H 2 O or Ce(CH 3 COO) 3 ·3H 2 O. Lanthanum source can be lanthanum oxide (La 2 o 3 ) or lanthanum carbonate (La 2 (CO 3 ) 3 ). The mass ratio of cerium source and lanthanum source is (0.1-2):(0.5-50).

[0018] Wherein, the bromide ion is in the form of hydrogen bromide gas or hydrobromic acid aqueous solution, that is, the bromide ion is derived from hydrogen bromide g...

Embodiment 1

[0039] Example 1: Anhydrous 0.5% Ce-doped LaBr 3 Powder preparation

Embodiment 2

[0040] Example 2: Anhydrous 5% Ce-doped LaBr 3 Powder preparation

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Abstract

The invention provides a preparation method of anhydrous cerium-doped lanthanum bromide. The preparation method comprises the following steps: (1) enabling a cerium source to react with a lanthanum source under the existence of bromide ions; (2) melting and cooling a reaction product obtained in the step (1) to obtain the anhydrous cerium-doped lanthanum bromide, wherein the step (1) and the step(2) are performed in a protective atmosphere or under vacuum. The invention provides the anhydrous cerium-doped lanthanum bromide of which the moisture content is lower than 100 ppm. The preparation method provided by the invention effectively solves the problem of non-uniform mixing of a solid and a solid; the operation steps are simple, reaction conditions are easy to reach, and the production cost is low. The anhydrous cerium-doped lanthanum bromide provided by the invention can be directly used for the growth of a cerium-doped lanthanum bromide scintillation crystal, obtained crystal cerium is uniformly distributed, and the performance is better.

Description

technical field [0001] The invention relates to the field of deep processing of rare earth materials. Specifically, the invention relates to a preparation method of anhydrous cerium-doped lanthanum bromide and anhydrous cerium-doped lanthanum bromide powder obtained by the method. Background technique [0002] Ce-doped lanthanum bromide (LaBr 3 The excellent performance of :Ce) scintillation crystal was discovered in 2001. It has very attractive characteristics, such as high photon output (80,000 photons / MeV), which is 2 times that of the existing scintillator (NaI(Tl)) with the highest luminous efficiency. times, and has a fast decay constant and a high damping coefficient. Using radioactive source 137Cs (662keV) γ-rays, it was found that for LaBr doped with 0.3% Ce 3 : The photon output of Ce scintillator is 61000 photons / MeV, LaBr doped with 10% Ce 3 : The photon output of Ce scintillator is up to 80000 photons / MeV. LaBr 3 : The energy resolution of the Ce scintillat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
CPCC01F17/253C01P2004/80C01P2006/80C01P2006/82
Inventor 魏建德佘建军方声浩叶宁张志诚
Owner 厦门中烁光电科技有限公司
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