Synthesis and decomposition of perovskite-type hydrides, MMgH3 (M = Na, K, Rb)
Synthesis and decomposition of perovskite-type hydrides, MMgH3 (M = Na, K, Rb)
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DOI：
10.1016/j.jallcom.2006.11.116
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发表时间：
2008-04
影响因子：
6.2
通讯作者：
K. Komiya;N. Morisaku;R. Rong;Y. Takahashi;Y. Shinzato;H. Yukawa;M. Morinaga
中科院分区：
文献类型：
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作者：
K. Komiya;N. Morisaku;R. Rong;Y. Takahashi;Y. Shinzato;H. Yukawa;M. Morinaga
采用球磨法合成了钙钛矿型氢化物MMgH3(M=Na,K,Rb)。它们在673-723K的温度下以多种方式分解，具体取决于M。即，NaMgH3在两步反应中分解，NaMgH3→NaH+Mg+H2和NaH→Na+(1/2)H2，而KMgH3在单步反应中分解，KMgH3→K+Mg+(3/2)H2。然而，RbMgH3在两步反应中发生了分解，但每个反应仍然存在不确定性。从MMgH3(M=Na、K、Rb)的ΔH实验值来看，相稳定性的变化顺序为RbMgH3>KMgH3>NaMgH3，其中NaMgH3最不稳定。
The perovskite-type hydrides, MMgH3(M=Na, K, Rb) were synthesized by ball-milling. They decomposed at the temperatures of 673–723K in several ways depending on M. Namely, NaMgH3decomposed in the two-step reactions, NaMgH3→NaH+Mg+H2and NaH→Na+(1/2)H2, whereas KMgH3decomposed in the single-step reaction, KMgH3→K+Mg+(3/2)H2. However, RbMgH3decomposed in the two-step reactions, but each reaction still remained uncertain. Judging from the experimental value of ΔH for MMgH3(M=Na, K, Rb), the phase stability was found to change in the order, RbMgH3>KMgH3>NaMgH3, so that NaMgH3is the most unstable among them.