Topotactic synthesis of strontium cobalt oxyhydride thin film with perovskite structure
Topotactic synthesis of strontium cobalt oxyhydride thin film with perovskite structure
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DOI：
10.1063/1.4935190
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发表时间：
2015-10
期刊：
影响因子：
1.6
通讯作者：
T. Katayama;A. Chikamatsu;Hideyuki Kamisaka;Y. Yokoyama;Y. Hirata;H. Wadati;T. Fukumura;T. Hasegawa
中科院分区：
文献类型：
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作者：
T. Katayama;A. Chikamatsu;Hideyuki Kamisaka;Y. Yokoyama;Y. Hirata;H. Wadati;T. Fukumura;T. Hasegawa
氢化物阴离子（H−）取代过渡金属氧化物最近已成为可能，通过拓扑反应或高压合成方法。然而，由于其固有的不太稳定的框架，制造氧杂环丁烷仍然是困难的。在本研究中，我们成功地制备了钙钛矿SrCoOxHy薄膜通过拓扑氢化物掺杂的brownmillerite SrCoO 2. 5外延薄膜与CaH 2。钙钛矿型的阳离子框架保持在拓扑处理由于外延稳定。结构和化学分析以及X射线吸收光谱测量表明，掺杂的氢化物离子形成了Co-H−-Co键的二维网络，与其他报道的钙钛矿氧化物SrMO 3 −xHx（M = Cr，Ti，V）相反。SrCoOxHy薄膜表现出绝缘行为，并且具有2.1eV的直接带隙。因此，在合适的衬底上对过渡金属氧化物薄膜进行拓扑氢化物掺杂是一种很有前途的方法。
The substitution of hydride anions (H−) into transition metal oxides has recently become possible through topotactic reactions or high-pressure synthesis methods. However, the fabrication of oxyhydrides is still difficult because of their inherently less-stable frameworks. In this study, we successfully fabricated perovskite SrCoOxHy thin films via the topotactic hydride doping of brownmillerite SrCoO2.5 epitaxial thin films with CaH2. The perovskite-type cation framework was maintained during the topotactic treatment owing to epitaxial stabilization. Structural and chemical analyses accompanied by X-ray absorption spectroscopy measurements revealed that the doped hydride ions form a two-dimensional network of Co-H−-Co bonds, in contrast to other reported perovskite oxyhydrides, SrMO3−xHx (M = Cr, Ti, V). The SrCoOxHy thin film exhibited insulating behavior and had a direct band gap of 2.1 eV. Thus, topotactic hydride doping of transition-metal-oxide thin films on suitable substrates is a promising method...