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Formation of SrBi2Ta2O9: Part II. Evidence of a bismuth-deficient pyrochlore phase

Published online by Cambridge University Press:  31 January 2011

Mark A. Rodriguez ,
Timothy J. Boyle ,
Bernadette A. Hernandez ,
Catherine D. Buchheit  and
Michael O. Eatough
Mark A. Rodriguez*
Affiliation:
Sandia National Laboratories, P.O. Box 5800, MS 1405, Albuquerque, New Mexico 87185–1405
Timothy J. Boyle
Affiliation:
Sandia National Laboratories, P.O. Box 5800, MS 1405, Albuquerque, New Mexico 87185–1405
Bernadette A. Hernandez
Affiliation:
Sandia National Laboratories, P.O. Box 5800, MS 1405, Albuquerque, New Mexico 87185–1405
Catherine D. Buchheit
Affiliation:
Sandia National Laboratories, P.O. Box 5800, MS 1405, Albuquerque, New Mexico 87185–1405
Michael O. Eatough
Affiliation:
Sandia National Laboratories, P.O. Box 5800, MS 1405, Albuquerque, New Mexico 87185–1405
*
a)Author to whom correspondence should be addressed
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Abstract

A bismuth-deficient pyrochlore phase has been observed in both powder and film samples fired at 775 °C. The estimated stoichiometry of this pyrochlore (based on calculated diffraction patterns) was Sr0.2(Sr0.5Bi0.7)Ta2O6.75. This bismuth-deficient pyrochlore phase may be considered deleterious to the formation of the SrBi2Ta2O9“SBT” ferroelectric compound since a significant presence of this pyrochlore compound implies a large deviation from the desired cation ratios. Additionally, films prepared on platinized silicon substrates indicate the SBT phase formation may be encouraged by the substrate; there appears to be some 00l preferential orientation for stoichiometric SBT thin films.

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Articles
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Journal of Materials Research , Volume 11 , Issue 9 , September 1996 , pp. 2282 - 2287
Copyright
Copyright © Materials Research Society 1996

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References

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