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Observation of a low-symmetry phase in Na0.5Bi0.5TiO3crystals by optical birefringence microscopy
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Gorfman, S., Glazer, A. M. (Anthony Michael), Noguchi, Y., Miyayama, M., Luo, H. and Thomas, Pam A. (2012) Observation of a low-symmetry phase in Na0.5Bi0.5TiO3crystals by optical birefringence microscopy. Journal of Applied Crystallography, Vol.45 (No.3). pp. 444-452. doi:10.1107/S0021889812008217 ISSN 0021-8898.
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Official URL: http://dx.doi.org/10.1107/s0021889812008217
Abstract
Single crystals of sodium bismuth titanate (Na0.5Bi0.5TiO3, NBT) (pure and Mn-doped) have been investigated by means of optical birefringence microscopy. For both crystals, it was found that, above 573 K, the optical axis is perfectly aligned with one of the pseudocubic <001>PC directions, while the domain walls appearing in the images are parallel to the pseudocubic <011>PC directions. These observations are consistent with a tetragonal symmetry. Below 573 K, the observed optical orientation of both crystals shows a broad angular distribution, with no clearly visible crystallographically oriented domain walls. These results are consistent with monoclinic symmetry. Most importantly, the direct observation of the temperature-driven rotation of the optical axis within the monoclinic plane is reported for the first time in a perovskite oxide material, in the present case for Mn-doped NBT. This has consequences for the understanding of phase transitions in technologically relevant compounds, such as PbZr1-xTixO3, which are considered to have monoclinic structure in some parts of the phase diagram.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Journal of Applied Crystallography | ||||
Publisher: | Wiley-Blackwell Publishing, Inc. | ||||
ISSN: | 0021-8898 | ||||
Official Date: | 2012 | ||||
Dates: |
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Volume: | Vol.45 | ||||
Number: | No.3 | ||||
Page Range: | pp. 444-452 | ||||
DOI: | 10.1107/S0021889812008217 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published |
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