In situ Raman spectroscopy of A-site doped barium titanate

PASHA, U. M., ZHENG, H., THAKUR, O. P., FETEIRA, Antonio, WHITTLE, K. R., SINCLAIR, D. C. and REANEY, I. M. (2007). In situ Raman spectroscopy of A-site doped barium titanate. Applied Physics Letters, 91 (6), 062908.

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Official URL: http://dx.doi.org/10.1063/1.2768881
Link to published version:: 10.1063/1.2768881

Abstract

Raman spectroscopy has been used to study the ferroelectric tetragonal to paraelectric cubic phase transition Tc in undoped BaTiO3 (BT) and (Ba0.92A0.08)TiO3 [where A = Ca (BCT), Sr (BST), and Pb (BPT)]. In BT and BPT, mode characteristic of the tetragonal phase at 303 and 710 cm−1 persisted until >50 °C above Tc, indicating the presence of local dynamic polar clusters well above the displacive phase transitions, ∼ 120 and ∼ 149 °C, respectively. However, in BCT and BST, the Raman spectra exhibited only broad second order bands above Tc, suggesting that Ca and Sr, A-site dopants supress local dynamic polar clusters.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number: 10.1063/1.2768881
Depositing User: Hilary Ridgway
Date Deposited: 06 Jun 2012 16:02
Last Modified: 06 Jun 2012 16:02
URI: http://shura.shu.ac.uk/id/eprint/5332

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