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Structural phase transition in the perovskite-type tantalum oxynitrides, Ca[1-x]Eu[x]Ta(O,N)[3]

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Title: Structural phase transition in the perovskite-type tantalum oxynitrides, Ca[1-x]Eu[x]Ta(O,N)[3]
Authors: Motohashi, Teruki Browse this author →KAKEN DB
Hamade, Yohei Browse this author
Masubuchi, Yuji Browse this author →KAKEN DB
Takeda, Takashi Browse this author
Murai, Kei-ichiro Browse this author
Yoshiasa, Akira Browse this author
Kikkawa, Shinich Browse this author
Keywords: Ceramics
Chemical synthesis
Electron diffraction
X-ray diffraction
Crystal structure
Issue Date: Sep-2009
Publisher: Elsevier Ltd.
Journal Title: Materials Research Bulletin
Volume: 44
Issue: 9
Start Page: 1899
End Page: 1905
Publisher DOI: 10.1016/j.materresbull.2009.05.011
Abstract: 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.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 本橋 輝樹

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