Synthesis and Thermal Stability of the Solid Solution AFeO2 (A = Ba, Sr, Ca)

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• 作者：Takafumi Yamamoto ; Zhaofei Li ; Cdric Tassel ; Naoaki Hayashi ; Mikio Takano ; Masahiko Isobe ; Yutaka Ueda ; Kenji Ohoyama ; Kazuyoshi Yoshimura ; Yoji Kobayashi ; Hiroshi Kageyama
• 刊名：Inorganic Chemistry
• 出版年：2010
• 出版时间：July 5, 2010
• 年：2010
• 卷：49
• 期：13
• 页码：5957-5962
• 全文大小：832K
• 年卷期：v.49,no.13(July 5, 2010)
• ISSN：1520-510X

文摘

We have studied the A-site substitution effect on the structural, thermal, and magnetic properties of the infinite layer iron oxide AFeO₂ (A = alkali-earth elements) with an FeO₄ square-planar coordination. Together with the previous study showing a total substitution by Ca, Ba substitution is found to be tolerable up to 30%, presenting almost the same substitutional range as that found in ACuO₂ under high pressure. Notably, Ba substitution shows little influence on the magnetic properties, in contrast to expectations from first principles calculations. The temperature at which oxidation to an AFeO_2.5 phase occurs and its transformation rate show a wide variation tunable solely by the out-of-plane distance.