Low-temperature hydrothermal synthesis of phase-pure (Ba,Sr)TiO3 perovskite using EDTA

Bonnie L. Gersten, Malgorzata M. Lencka, Richard E. Riman

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25 Scopus citations

Abstract

A thermodynamic model was developed to describe the stability of (Ba,Sr)TiO3 (BST) solid solutions in the Ba-Sr-Ti-K-(EDTA)-H 2O (EDTA = ethylenediaminetetraacetic acid) system. Phase diagrams were computed to identify the range of conditions suitable for making phase-pure BST. Hydrothermal experiments were performed to validate the thermodynamic model. The model was found to be more useful when an ideal solid solution was used to estimate the energetics for the BST phase instead of experimental thermodynamic data. In addition, EDTA was found to promote stable conditions for BST formation. When attempting to prepare Ba0.50Sr 0.50TiO3 without EDTA, BaTiO3-rich and SrTIO3-rich phases precipitated separately, at 70°-160°C. However, in the presence of EDTA, a phase-pure Ba0.55Sr 0.45TiO3 solid solution was obtained at 90°-120°C. EDTA is effective because it prevents phase heterogeneities from forming and equalizes the adsorption affinity of strontium and barium species.

Original languageEnglish (US)
Pages (from-to)2025-2032
Number of pages8
JournalJournal of the American Ceramic Society
Volume87
Issue number11
DOIs
StatePublished - Nov 2004

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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