Low-Temperature Synthesis of Perovskite-Type (Na,K)NbO₃ through Nb₆O₁₉⁸⁻ Clusters by Dissolution–Precipitation Method

• Shibata Kengo

  Department of Materials Chemistry, Ryukoku University

• Yamazoe Seiji

  Department of Materials Chemistry, Ryukoku University Department of Chemistry, School of Science, The University of Tokyo

• Wada Takahiro

  Department of Materials Chemistry, Ryukoku University

書誌事項

タイトル別名

• Low-Temperature Synthesis of Perovskite-Type (Na,K)NbO₃ through Nb₆O₁₉⁸⁻ Clusters by Dissolution–Precipitation Method

抄録

We successfully synthesized perovskite-type (Na_1−xK_x)NbO₃ materials from a Na₃NbO₄ precursor at low temperature by dissolution–precipitation method. The Nb₆O₁₉⁸⁻ cluster was formed as an intermediate by the dissolution of Na₃NbO₄ into a buffer solution (pH 7). White powders were precipitated by the addition of 1 M NaOH/KOH mixed aqueous solution. We found that the morphology and crystal structure depended on the NaOH/KOH ratio. When the concentration of KOH [C_KOH = KOH/(NaOH + KOH)] was low (0 ≤ C_KOH ≤ 0.3), rod-like (Na,K,H₃O)₈Nb₆O₁₉·14H₂O was precipitated. In the case of high C_KOH (0.5 ≤ C_KOH ≤ 0.9), (Na_0.5K_0.5)₈Nb₆O₁₉·9H₂O, whose morphologies changed from hexagonal plate-like to truncated hexagonal bipyramidal structures with the increase in the C_KOH, was formed. The (Na,K,H₃O)₈Nb₆O₁₉·14H₂O and (Na_0.5K_0.5)₈Nb₆O₁₉·9H₂O mixture was precipitated using a NaOH/KOH solution with C_KOH = 0.4. No precipitation was obtained by the addition of the KOH solution. These precipitations transformed into perovskite-type (Na,K)NbO₃ while maintaining their morphology by calcination at 500 °C. The excess Na and/or K were washed out with water. From the lattice constants, the rod-like (Na_1−xK_x)NbO₃ with 0 ≤ x ≤ 0.2 and the hexagonal plate-like or the truncated hexagonal bipyramidal (Na_0.5K_0.5)NbO₃ were synthesized from the rod-like (Na,K,H₃O)₈Nb₆O₁₉·14H₂O (0 ≤ C_KOH ≤ 0.3) and the hexagonal plate-like or the truncated hexagonal bipyramidal (Na_0.5K_0.5)₈Nb₆O₁₉·9H₂O (0.5 ≤ C_KOH ≤ 0.9), respectively.

収録刊行物

• Bulletin of the Chemical Society of Japan

  Bulletin of the Chemical Society of Japan 87 (6), 746-750, 2014

  公益社団法人 日本化学会

キーワード

• General Chemistry

詳細情報

• CRID: 1390282679120594176
• NII論文ID: 130004059119
• NII書誌ID: AA00580132
• DOI: 10.1246/bcsj.20140060
• COI: 1:CAS:528:DC%2BC2cXhtFeqtbvJ
• ISSN: 13480634
• ISSN: 00092673
• NDL書誌ID: 025507908
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025507908
• Web Site: https://academic.oup.com/bcsj/article-pdf/87/6/746/56277010/bcsj.20140060.pdf
• 本文言語コード: en
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