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

Abstract:

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.

• Periodical: Journal of Metastable and Nanocrystalline Materials (Volume 23)
• Pages: 59-62
• DOI: https://doi.org/10.4028/www.scientific.net/JMNM.23.59
• Online since: January 2005
• Authors: W.S. Toh, Z.H. Zhou, J.M. Xue, J. Wang, Zoe H. Barber, J.E. Evetts
• Keywords: Ceramic, Mechanical Activation (MA), Nanocrystalline, SrBi₂Ta_1.8W_0.2O₉, W-Doped SrBi₂Ta₂O₉

References

This article has no references.