Abstract This paper reported an efficient and economical method for preparation of anhydrous LaBr3 for scintillation crystal growth. High purity anhydrous LaBr3 powders in large quantities were successfully obtained by stepped dehydration of LaBr3·7H2O using NH4Br as additive. Experiments revealed that adding proper amount of NH4Br could effectively restrain the hydrolysis of LaBr3 during dehydration and thus decreased the yield of deleterious impurity of LaOBr. Optimum preparation conditions, including the amount of NH4Br in use, the dehydration temperature and atmosphere, were investigated by DTA/TG and water/oxygen analysis. The Raman characterization of the as-prepared anhydrous LaBr3 was also presented.

中文翻译：

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用于闪烁晶体生长的无水溴化镧的制备

摘要 本文报道了一种高效、经济的制备用于闪烁晶体生长的无水LaBr3的方法。以NH4Br为添加剂，对LaBr3·7H2O进行分级脱水，成功获得了大量高纯度无水LaBr3粉末。实验表明，在脱水过程中加入适量的NH4Br可以有效抑制LaBr3的水解，从而降低LaOBr有害杂质的产率。通过 DTA/TG 和水/氧分析研究了最佳制备条件，包括使用的 NH4Br 量、脱水温度和气氛。还介绍了所制备的无水 LaBr3 的拉曼表征。