Raman scattering study of the effect of A- and B-site substitution on the room-temperature structure of ABi4Ti4O15

Prasetyo, Anton, Mihailova, Boriana, Suendo, Veinardi, Nugroho, Agustinus Agung and Ismunandar, Ismunandar (2017) Raman scattering study of the effect of A- and B-site substitution on the room-temperature structure of ABi4Ti4O15. Presented at 3rd International Conference on Functional Materials Science 2016, 19–20 October 2016, Sanur-Bali, Indonesia.

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Abstract

Aurivillius-type materials exhibit promising ferroelectric and multiferroic properties that can be tailored via chemistry variations in the perovskite block. Hence, it is important to clarify the relations composition-structure, also on a local-scale level. The aim of this contribution is to give further insights into the effect of A- and B-site cations to the roomtemperature local structure of Aurivillius four-layeredABi4Ti4O15 (A = Sr, Pb, Ba) and Pb1- xBi4+xTi4-xMnxO15 (x = 0, 0.2, 0.4) by Raman scattering. The effect of A-site cation to the local structure of perovskite block was identified by the phonon mode near 750 and 870 cm-1arising from BO6 stretching. A-site Ba2+, having the largest ionic radius among the considered elements, significantly stiffens the TiO6 octahedra, as derived from the fact that the TiO6 stretching modes have the highest wavenumber for BaBi4Ti4O15, i.e. the Ti-O bond strength is strongest for this compound. The replacement of Ti4+ by Mn3+ cation at the B- site also influences the B-O bond. The comparison of the phonon modes near 700 and 870 cm-1 in Pb1-xBi4+xTi4-xMnxO15 with x = 0, 0.2, and 0.4 shows that the lowest wavenumber, which is due to the elongation of Ti-O bonds is observed for x = 0.4.

Item Type:	Conference (Paper)
Subjects:	03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030206 Solid State Chemistry 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:	01 Sep 2020 09:05

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