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Local structure of perovskite-type oxyfluorides, BaFeO$$_2$$F and BaInO$$_2$$F

ペロブスカイト型酸フッ化物BaFeO$$_2$$F and BaInO$$_2$$Fの局所構造解析

勝又 哲裕*; 稲熊 宜之*; 相見 晃久*; 米田 安宏   

Katsumata, Tetsuhiro*; Inaguma, Yoshiyuki*; Aimi, Akihisa*; Yoneda, Yasuhiro

新規物質の探索には、組成の柔軟性を持つ化合物の探索が必要である。ペロブスカイト型オキシフルオライドのような混合アニオン化合物は有望な材料である。これらの化合物では、構造とトレランスファクターtの関係が興味深い。本研究では、BaInO$$_2$$F(t=0.97)、BaScO$$_2$$F(t=0.99)およびBaFeO$$_2$$Fという様々なtを持つペロブスカイト型オキシフルオライドを合成し、X線回折とペア分布(PDF)法を用いて、それぞれ局所構造と平均構造を調べた。さらに、構造とトレランスファクターtの関係について議論した。

The search for novel materials requires the search for compounds with compositional flexibility. Mixed anion compounds such as perovskite oxyfluorides are promising materials. In these compounds, the relationship between structure and tolerance factor t is interesting. In this study, perovskite oxyfluorides with various t, BaInO$$_2$$F (t=0.97), BaScO$$_2$$F (t=0.99) and BaFeO$$_2$$F, were synthesized and their local and average structures were investigated by X-ray diffraction and pair distribution (PDF) methods, respectively. Furthermore, the relationship between the structure and the tolerance factor t was discussed.

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