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Title: | Long- and short-range structure studies of KBT-KBZ solid-solutions using synchrotron radiation |
Authors: | Liu, S Blanchard, PER Zhang, Z Kennedy, BJ Ling, CD |
Keywords: | X-ray diffraction Order-disorder transformations Crystal-phase transformations Powders Ferrimagnetic materials Absorption Perovskites ADP |
Issue Date: | 14-Jan-2015 |
Publisher: | Royal Society of Chemistry |
Citation: | Liu, S., Blanchard, P. E., Zhang, Z., Kennedy, B. J., & Ling, C. D. (2015). Long-and short-range structure studies of KBT-KBZ solid-solutions using synchrotron radiation. Dalton Transactions, 44(23), 10681-10688. doi:10.1039/C4DT03866E |
Abstract: | The relaxor ferroelectric K0.5Bi0.5TiO3 has been synthesised in a solid-solution series with K0.5Bi0.5ZrO3, as K0.5Bi0.5Ti1−xZrxO3. High-resolution synchrotron X-ray powder diffraction and X-ray absorption near edge structure spectroscopy were used to characterise the long-range average and local structural behaviour. Rietveld refinements against diffraction data show that a pseudocubic tetragonal region exists across the whole solid-solution series, with truly cubic symmetry only observed at x = 1 (pure KBZ). Variable-temperature diffraction data for x = 0 (pure KBT) showed a broad ferroelectric transition from tetragonal to cubic symmetry at approximately 683 K with a coexistence of both phases close to that temperature, accompanied by a marked volume contraction. Ti K-edge data showed that Zr doping has a minimal effect on Ti off-centering, and revealed no evidence for local clustering. Metal L-edges showed that Ti4+ cations remain off-centered with increasing Zr content, while Zr4+ cations approach a higher-symmetry coordination environment, most likely due to the increased size of the Zr atoms. Although there is a minimal effect on actual Ti-offsets, an effective dilution of these environments by Zr doping leads to a reduction in polar domains and a diminished ferroelectric response. © 2015 Royal Society of Chemistry |
Gov't Doc #: | 9078 |
URI: | https://doi.org/10.1039/C4DT03866E http://apo.ansto.gov.au/dspace/handle/10238/9008 |
ISSN: | 1477-9234 |
Appears in Collections: | Journal Articles |
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