Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 69, Issue 1, Pages 193-198Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2007.08.053
Keywords
electronic materials; chemical synthesis; phase equilibria
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In the framework of the Lencka-Riman thermodynamic model, we give a theoretical design for the hydrothermal synthesis of pure KNbO3 powder in a K-Nb-O tri-component system, where the stability yield diagrams and the optimum conditions (i.e., synthesis temperature, precursor concentrations, solution pH) are provided. Additionally, a hydrothermal experiment is carried out to synthesize KNbO3 powder by reacting niobium pentoxide with potassium hydroxide at a temperature above 523 K and highly alkaline conditions. It is found that the experiment is in great agreement with the theoretical design. This research shows that the newly developed Lencka-Riman model is a powerful theoretical tool for designing hydrothermal synthesis of new materials. (c) 2007 Elsevier Ltd. All rights reserved.
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