分别在Ar气和H2气气氛下对LaMg12进行热分解实验,采用原位X射线衍射(in-situ XRD)分析LaMg12相分解过程.结果表明,该合金在Ar气中加热到330℃,合金处于稳定状态,而在H2气气氛中加热到大约290℃时,开始分解为LaH3和MgH2.Rietveld分析结果表明.分解前LaMg12的点阵常数没有变化,证明氢原子并未进入合金形成LaMg12Hx固溶体.可以推测出.在H2气气氛中,由于氢致作用产生大量的空位,致使La或Mg易于向表面移动,出现分解现象.
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