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Hydrothermal synthesis of perovskite and pyrochlore powders of potassium tantalate

Published online by Cambridge University Press:  31 January 2011

Gregory K. L. Goh ,
Sossina M. Haile ,
Carlos G. Levi  and
Fred F. Lange
Gregory K. L. Goh*
Affiliation:
Materials Department and Materials Research Laboratory, University of California—Santa Barbara, Santa Barbara, California 93106
Sossina M. Haile
Affiliation:
Materials Science Department 138-78, California Institute of Technology, 1200 California Boulevard, Pasadena, California 91125
Carlos G. Levi
Affiliation:
Materials Department and Materials Research Laboratory, University of California—Santa Barbara, Santa Barbara, California 93106
Fred F. Lange
Affiliation:
Materials Department and Materials Research Laboratory, University of California—Santa Barbara, Santa Barbara, California 93106
*
a)Address all correspondence to this author.Present address : Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Repubic of Singapore g-goh@imre.org.sg
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Abstract

Potassium tantalate powders were hydrothermally synthesized at 100 to 200 °C in 4 to 15 M aqueous KOH solutions. A defect pyrochlore, Kta2O5(OH). nH2O (n ≈ 1.4), was obtained at 4 M KOH, but at 7–12 M KOH, this pyrochlore was gradually replaced by a defect perovskite as the stable phase. At 15 M KOH, there was no intermediate pyrochlore, only a defect perovskite, 0.85Ta0.92O2.43(OH)0.57 0.15H2O. Synthesis at higher KOH concentrations led to greater incorporation of protons in the perovskite structures. The potassium vacancies required for charge compensation of incorporated protons could accommodate water molecules in the perovskite structure.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3168 - 3176
Copyright
Copyright © Materials Research Society 2002

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