Nanocrystalline W-Doped SrBi2Ta2O9 of Layered Perovskite Structure Derived from Mechanical Activation

Abstract:

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To study the effects of doping the layered perovskite SrBi2Ta2O9 with an appropriate amount of tungsten, both undoped and W-doped SrBi2Ta2O9 (SBT) of nanocrystallinity were synthesized by mechanical activation of constituent oxides of strontium oxide, bismuth oxide, tantalum oxide and tungsten oxide at room temperature. A nanocrystalline single perovskite phase was observed in SrBi2(Ta1-xWx)2O9 with up to x=0.1. SrBi2(Ta0.9W0.1)2O9 shows a higher Curie temperature than that of undoped SBT, although it exhibits a very similar layered perovskite structure. The ferroelectric and impedance behaviors of SrBi2 (Ta0.9W0.1)2O9 were studied over a range of test temperatures and frequencies, in order to understand the effects of W-doping in SBT, given that W exhibits a similar ionic size to Ta but with a variable valence.

Info:

Edited by:

M. Gupta and Christina Y.H. Lim

Pages:

59-62

DOI:

10.4028/www.scientific.net/JMNM.23.59

Citation:

W.S. Toh et al., "Nanocrystalline W-Doped SrBi2Ta2O9 of Layered Perovskite Structure Derived from Mechanical Activation", Journal of Metastable and Nanocrystalline Materials, Vol. 23, pp. 59-62, 2005

Online since:

January 2005

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$35.00

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