Hydrothermal synthesis of KNbO3 and NaNbO3 powders

Gregory K L Goh, Fred F. Lange, Sossina M. Haile, Carlos G. Levi

Research output: Contribution to journalArticle

148 Scopus citations

Abstract

Orthorhombic KNbO3 and NaNbO3 powders were hydrothermally synthesized in KOH and NaOH solutions (6.7-15 M) at 150 and 200 °C. An intermediate hexaniobate species formed first before eventually converting to the perovskite phase. For synthesis in KOH solutions, the stability of the intermediate hexaniobate ion increased with decreasing KOH concentrations and temperatures. This led to significant variations in the induction periods and accounted for the large disparity in the mass of recovered powder for different processing parameters. It is also believed that protons were incorporated in the lattice of the as-synthesized KNbO3 powders as water molecules and hydroxyl ions.

Original languageEnglish (US)
Pages (from-to)338-345
Number of pages8
JournalJournal of Materials Research
Volume18
Issue number2
DOIs
StatePublished - Feb 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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