Preparation of needle-like NaNbO3 by molten NaOH method

Seiji YAMAZOE; Takuya KAWAWAKI; Takahito IMAI; Takahiro WADA

doi:10.2109/jcersj2.118.741

Feature: Evolution of Dielectric Materials: Notes

Preparation of needle-like NaNbO₃ by molten NaOH method

Seiji YAMAZOE, Takuya KAWAWAKI, Takahito IMAI, Takahiro WADA

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Keywords: NaNbO₃, Molten NaOH, Na₇(H₃O)Nb₆O₁₉·14H₂O, Na₇(H₃O)Nb₆O₁₉·H₂O, Perovskite

JOURNAL FREE ACCESS

2010 Volume 118 Issue 1380 Pages 741-744

DOI https://doi.org/10.2109/jcersj2.118.741

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Abstract

Needle-like NaNbO₃ has been prepared in two steps by a molten NaOH method. First, Na₇(H₃O)Nb₆O₁₉·14H₂O precursor was synthesized by the reaction of Nb₂O₅ with a molten NaOH at 450°C for 50 h in air. The Na₇(H₃O)Nb₆O₁₉·14H₂O precursor was a needle-like single crystal 0.25–1.5 µm wide and >3 µm long. Then, the Na₇(H₃O)Nb₆O₁₉·14H₂O precursor crystal transformed to NaNbO₃ through an intermediate Na₇(H₃O)Nb₆O₁₉ by a heating above 500°C. The NaNbO₃ was a needle-like polycrystal with a perovskite-type structure.

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