Nanocrystalline W-Doped SrBi2Ta2O9 of Layered Perovskite Structure Derived from Mechanical Activation
| Periodical | Journal of Metastable and Nanocrystalline Materials (Volume 23) |
|---|---|
| Main Theme | Science and Technology of Nanomaterials |
| 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., 2005, Journal of Metastable and Nanocrystalline Materials, 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, SrBi2Ta1.8W0.2O9, W-Doped SrBi2Ta2O9 |
| Price | US$ 28,- |
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.
