Further insights into the structural transformations in PbBi4Ti4O15 revealed by Raman spectroscopy

Prasetyo, Anton, Mihailova, Boriana, Suendo, Veinardi and Nugroho, Agustinus Agung (2015) Further insights into the structural transformations in PbBi4Ti4O15 revealed by Raman spectroscopy. Journal of Applied Physics, 117 (6). 064102. ISSN 0021-8979

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Abstract

The structural transformations in PbBi4Ti4O15 (PBT) induced by decreasing the temperature from 850 to 120 K were investigated using Raman spectroscopy. The temperature evolution of phonon modes revealed structural alterations in PBT occurred near 800, 600, and 400 K. The paraelectric-ferroelectric phase transition at 800 K was clearly observed in the temperature behavior of the low-energy phonon mode at 60 cm-1 that has been previously attributed to a displacement of the Bi2O2 plane with respect to the Aurivillius perovskite-like block, emphasizing that this is the phonon mode driving the system into a ferroelectric state. The structural transformation near 600 K was identified from the mode at 40 cm-1 related to Pb/Bi vibrations in the perovskite-like block as well as modes at 130 and 220 cm-1 caused by octahedral tilting of TiO6. The temperature of this structural alteration matches the second anomaly observed in the dielectric permittivity of PBT, so it causes minor spontaneous polarization in this material. The temperature dependence of the mode at 60 cm-1 also revealed a structural transformation at 400 K that is not related to the ferroelectric properties of PBT. © 2015 AIP Publishing LLC.

Item Type:	Journal Article
Divisions:	Faculty of Mathematics and Sciences > Department of Chemistry
Depositing User:	Faizuddin Harliansyah
Date Deposited:	24 May 2018 17:15

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