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Micro-Raman scattering of bismuth titanate at low temperature

โœ Scribed by J. F. Meng; R. S. Katiyar; G. T. Zou

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
404 KB
Volume
28
Category
Article
ISSN
0377-0486

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โœฆ Synopsis

Micro-Raman spectra measurements in the wavenumber region 20-900 cm-1 reveal a complex temperature dependence of the Raman phonon modes on cooling ceramics down to 70 K. An anomalous line narrow-Bi 2 Ti 4 O 11 ing behavior of some phonon modes is observed and is associated with ordered distributions of Bi atoms as the temperature is decreased. An anomaly in intensity, wavenumber and linewidth for the phonon modes at ยฟ250 K is attributed to an order-disorder phase transition at this temperature. The origin of higher wavenumber phonon modes and the soft mode at 38 cm-1 is discussed.

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