Formation of SrBi2Ta2O9: Part II. Evidence of a bismuth-deficient pyrochlore phase
- 1 September 1996
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 11 (9) , 2282-2287
- https://doi.org/10.1557/jmr.1996.0290
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.Keywords
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