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: ジャーナルへの寄稿記事

4 引用 (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

元の言語英語
記事番号09PB08
ジャーナルJapanese Journal of Applied Physics
53
発行部数9
DOI
出版物ステータス出版済み - 1 1 2014
外部発表Yes

Fingerprint

molten salts
Platelets
platelets
Bismuth
bismuth
Molten materials
Salts
synthesis
expulsion
Growth temperature
Epitaxial growth
Perovskite
epitaxy
heat treatment
Heat treatment
Sodium
sodium
microstructure
Microstructure
temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

これを引用

Platelet NaNbO3grown by single-step molten salt synthesis : Study on bismuth migration in topochemical conversion reaction. / Watanabe, Takayuki; Watanabe, Masatoshi; Suzuki, Tatsuya; Yamabi, Satoshi; Yabuta, Hisato; Miura, Kaoru; Ito, Naoko; Kumada, Nobuhiro.

:: Japanese Journal of Applied Physics, 巻 53, 番号 9, 09PB08, 01.01.2014.

研究成果: ジャーナルへの寄稿記事

Watanabe, Takayuki ; Watanabe, Masatoshi ; Suzuki, Tatsuya ; Yamabi, Satoshi ; Yabuta, Hisato ; Miura, Kaoru ; Ito, Naoko ; Kumada, Nobuhiro. / Platelet NaNbO3grown by single-step molten salt synthesis : Study on bismuth migration in topochemical conversion reaction. :: Japanese Journal of Applied Physics. 2014 ; 巻 53, 番号 9.
@article{5aa8a911435f4490917c257591c5a996,
title = "Platelet NaNbO3grown by single-step molten salt synthesis: Study on bismuth migration in topochemical conversion reaction",
abstract = "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",
author = "Takayuki Watanabe and Masatoshi Watanabe and Tatsuya Suzuki and Satoshi Yamabi and Hisato Yabuta and Kaoru Miura and Naoko Ito and Nobuhiro Kumada",
year = "2014",
month = "1",
day = "1",
doi = "10.7567/JJAP.53.09PB08",
language = "English",
volume = "53",
journal = "Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes",
issn = "0021-4922",
publisher = "Institute of Physics",
number = "9",

}

TY - JOUR

T1 - Platelet NaNbO3grown by single-step molten salt synthesis

T2 - Study on bismuth migration in topochemical conversion reaction

AU - Watanabe, Takayuki

AU - Watanabe, Masatoshi

AU - Suzuki, Tatsuya

AU - Yamabi, Satoshi

AU - Yabuta, Hisato

AU - Miura, Kaoru

AU - Ito, Naoko

AU - Kumada, Nobuhiro

PY - 2014/1/1

Y1 - 2014/1/1

N2 - 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

AB - 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

UR - http://www.scopus.com/inward/record.url?scp=84908091882&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84908091882&partnerID=8YFLogxK

U2 - 10.7567/JJAP.53.09PB08

DO - 10.7567/JJAP.53.09PB08

M3 - Article

AN - SCOPUS:84908091882

VL - 53

JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

SN - 0021-4922

IS - 9

M1 - 09PB08

ER -