The effect of the A-Site cation on the structural transformations in ABi4Ti4O15 (A¼ Ba, Sr): Raman scattering studies

Prasetyo, Anton, Mihailova, Boriana, Suendo, Veinardi, Nugroho, Agustinus Agung and Ismunandar, Ismunandar (2020) The effect of the A-Site cation on the structural transformations in ABi4Ti4O15 (A¼ Ba, Sr): Raman scattering studies. Journal of Solid State Chemistry, 283 (121131). ISSN 0022-4596

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Abstract

The effect of the type of A-site cation on the structural transformations of ABi4Ti4O15 (A¼ Ba, Sr) was studied by a
comparative analysis of the Raman scattering of BaBi4Ti4O15 and SrBi4Ti4O15 in the temperature range 120–850
K. The results are also compared with those previously reported on PbBi4Ti4O15. Similar to PbBi4Ti4O15, BaBi4-
Ti4O15, and SrBi4Ti4O15 exhibit an additional structural transformation at Ta < Tc and Ta decreases with the
increase in the ionic radius of the A-site cation. This structural alteration consists of rearrangements of the A-site cations, which for A¼ Ba is accompanied by readjustment of the octahedral tilting and a change in the BO6 geometry. The results presented here confirm that the development of spontaneous polarization in four-layer
Aurivillius-type ferroelectrics is triggered by the rigid-layer phonon mode, i.e., vibrations of the Bi2O2 planes relative to the perovskite-like blocks, rather than by cationic vibrations only within the perovskites blocks.

Item Type: Journal Article
Keywords: ABi4Ti4O15 (A= Ba; Sr); raman scattering; temperature dependence; structural transformation; ionic radii of A-site cation
Subjects: 03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl. Structural) > 030606 Structural Chemistry and Spectroscopy
Divisions: Faculty of Mathematics and Sciences > Department of Chemistry
Depositing User: Dr Anton Prasetyo
Date Deposited: 10 May 2020 00:33

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