Suppression of H ? /O 2? exchange by incorporated nitride anions in the perovskite lattice
Suppression of H ? /O 2? exchange by incorporated nitride anions in the perovskite lattice
复制标题
抑制H ?
DOI：
10.1016/j.jssc.2017.08.025
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发表时间：
2017
影响因子：
3.3
通讯作者：
Kageyama Hiroshi
中科院分区：
文献类型：
--
作者：
Takeiri Fumitaka;Yajima Takeshi;Yamamoto Takafumi;Kobayashi Yoji;Matsui Toshiaki;Hester James;Kageyama Hiroshi
研究了钙钛矿氧氮化物中氢化物和氧化物的低温阴离子交换行为。（Sr1-xLax）Ti(O3-xNx) （0<x≤1）的cah2还原导致氢化物选择性阴离子交换为氧化物而非氮化物，生成氧氢化物-氮化物（Sr1-xLax）Ti（O3-x-yHyNx）。然而，随着氮含量的增加，氢化物的交换被急剧抑制，当氮含量达到阴离子位点的10%时，氢化物的交换完全受阻。这表明氧化晶格中的n3阴离子在降低O2 -（和H -）的扩散中起着至关重要的作用。目前的研究表明，在操纵阴离子组成时，特别是在具有少量阴离子空位的混合阴离子体系中，有必要考虑动力学方面。
We investigate the low temperature anion exchange behavior of hydride and oxide in perovskite oxynitrides. CaH2reduction of (Sr1–xLax)Ti(O3–xNx) (0<x≤ 1) resulted in the selective anion exchange of hydride for oxide rather than nitride, yielding the oxyhydride-nitride (Sr1–xLax)Ti(O3–x–yHyNx). However, the exchange of hydride is drastically suppressed with increasing nitrogen content and is completely impeded when the nitride content reaches 10% of the anionic site. This implies that the N3–anions in the oxide lattice play a crucial role in lowering diffusion of O2–(and H–). The present study indicates the necessity to consider kinetic aspects when manipulating anion compositions, in particular in a mixed anion system with a small amount of anion vacancies.