以化学气相传输法制取无水LaBr3、GdBr3和LuBr3.以稀土氧化物为原料,与铝粉及溴直接进行反应,可得到LnBr3和Al2O3的混合物.当铝与溴过量时,铝与溴生成的AlBr3,在高温下形成气态Al2Br6,并与LnBr3反应得到气态配合物,该配合物在低温分解.控制适当的温度梯度场,可实现LnBr3与其他固体分离.产物纯度＞99.5%.利用化学气相传输法可获得纯度较高的无水LnBr3.
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