Water Soluble Na[Nb(O2)3]•2H2O as a New Molecular Precursor for Synthesis of Sodium Niobate

Deepa DEY; Valery PETRYKIN; Satoshi SASAKI; Masato KAKIHANA

doi:10.2109/jcersj2.115.808

Feature: Aqueous Solution Science for Ceramic Processing: Papers

Water Soluble Na[Nb(O₂)₃]•2H₂O as a New Molecular Precursor for Synthesis of Sodium Niobate

Deepa DEY, Valery PETRYKIN, Satoshi SASAKI, Masato KAKIHANA

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Keywords: Water-soluble molecular precursor, Sodium triperoxo niobium, Tetraperoxo niobium complex, Low-temperature synthesis, NaNbO₃

JOURNAL FREE ACCESS

2007 Volume 115 Issue 1348 Pages 808-812

DOI https://doi.org/10.2109/jcersj2.115.808

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Abstract

A water-soluble tetraperoxo niobate [Nb(O₂)₄]^3- was prepared by reaction of niobic acid with H₂O₂ at pH=11 in aqueous ammonia solution. The corresponding ammonium salt, (NH₄)₃[Nb(O₂)₄], was grown as a single crystal, and its crystal structure was solved. A white precipitate has been obtained from the solution containing (NH₄)₃[Nb(O₂)₄] and Na₂CO₃. Based on the elemental, TG, redox titration and Raman spectroscopic analyses, we have concluded that the obtained compound was Na[Nb(O₂)₃]•2H₂O. This compound has been demonstrated to be a convenient precursor for synthesis of NaNbO₃ by simple calcinations in air at the reduced temperature of 400-500°C.

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