Platelet NaNbO3grown by single-step molten salt synthesis: Study on bismuth migration in topochemical conversion reaction

Takayuki Watanabe, Masatoshi Watanabe, Tatsuya Suzuki, Satoshi Yamabi, Hisato Yabuta, Kaoru Miura, Naoko Ito, Nobuhiro Kumada

研究成果: Contribution to journalArticle査読

4 被引用数 (Scopus)

抄録

Platelet NaNbO3grains were grown at 1150-1225 °C by single-step molten salt synthesis. The structural and compositional transformation from the precursor Aurivillius phase to perovskite NaNbO3by the topochemical conversion reaction was studied. No compositional distribution was confirmed for the platelet grains grown at 1150 °C, whereas it was observed that the expulsion of bismuth and incorporation of sodium were simultaneously initiated in spots for the grains grown at 1170 °C. With increasing the growth temperature the topochemical conversion reaction was promoted, and single-phase NaNbO3 grains were eventually grown with heat treatment at 1225 °C for 6 h. In order to trace the structural transformation due to the topochemical conversion reaction, preconversion and postconversion platelet grains were chosen for characterizing the microstructure. It was found that the precursor Aurivillius phase is a mixed phase described as Bi2.5Nam-1.5NbmO3m+3(m = 5, 6, and 8). In the interior of the platelet grains, migration paths vertically elongated to the principal surface are created, and bismuth is expelled via the vertical path as well as the horizontal path along the (Bi2O2)2+layer. It was concluded that the distinctive migration network contributed to the structural transformation while maintaining the epitaxy

本文言語英語
論文番号09PB08
ジャーナルJapanese journal of applied physics
53
9
DOI
出版ステータス出版済み - 10 1 2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • 工学(全般)
  • 物理学および天文学(全般)

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