Structural phase transition in the perovskite-type tantalum oxynitrides, Ca[1-x]Eu[x]Ta(O,N)[3]
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概要
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Pure Ca[1-x]Eu[x]Ta(O,N)[3] were successfully synthesized in the whole range of Ca/Eu compositions by means of ammonia nitridation via a citrate precursor route. As-nitrided products with x < 0.4 were apparently orthorhombic, while those with x ≥ 0.4 crystallized in a cubic structure. The anionic composition was found to be essentially O2N and independent of Eu content(x). The as-nitrided EuTaO2N possessed a cubic perovskite-type structure, while high-temperature post-annealing led to a tetragonal EuTaO2N phase with better crystallinity. The re-nitridation transformed the post-annealed product into the original cubic lattice, which might be an average of the tetragonal micro-domains.
著者
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鱒渕 友治
北大院工
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Masubuchi Yuji
Graduate School Of Engineering Hokkaido Univ. Sapporo 060-8628 Jpn
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Kikkawa Shinichi
Graduate School Of Engineering Hokkaido University
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鱒渕 友治
北海道大学工学研究院物質化学部門
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Murai Kei-ichiro
Department Of Chemical Science And Technology Tokushima University
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Takeda Takashi
Nano Ceramics Center National Institute For Materials Science
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