Synthesis and thermal stability of the solid solution AFeO2 (A = Ba, Sr, Ca).
Synthesis and thermal stability of the solid solution AFeO2 (A = Ba, Sr, Ca).
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DOI：
10.1021/ic100452m
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发表时间：
2010-05
影响因子：
4.6
通讯作者：
Takafumi D. Yamamoto;Zhaofei Li;C. Tassel;N. Hayashi;M. Takano;M. Isobe;Y. Ueda;K. Ohoyama;K. Yoshimura;Y. Kobayashi;H. Kageyama
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文献类型：
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作者：
Takafumi D. Yamamoto;Zhaofei Li;C. Tassel;N. Hayashi;M. Takano;M. Isobe;Y. Ueda;K. Ohoyama;K. Yoshimura;Y. Kobayashi;H. Kageyama
我们研究了A位取代对无限层状铁氧化物AFeO（2）（A =碱土金属元素）的结构、热学和磁学性质的影响。与先前的研究表明Ca完全取代一起，发现Ba取代可耐受高达30%，与高压下ACuO（2）中发现的取代范围几乎相同。值得注意的是，Ba替代显示对磁性的影响很小，与第一原理计算的预期相反。发生氧化成AFeO（2.5）相的温度及其转变速率显示出仅由面外距离可调的宽变化。
We have studied the A-site substitution effect on the structural, thermal, and magnetic properties of the infinite layer iron oxide AFeO(2) (A = alkali-earth elements) with an FeO(4) 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 ACuO(2) 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.