Mondal, A and Saha, P and Ghosh, B and Sahu, M and Mukherjee, GD and Ranjan, R and Brajesh, K (2020) High-pressure structural investigation on lead-free piezoelectric 0.5Ba(Ti0.8Zr0.2)O3Â -Â 0.5(Ba0.7Ca0.3)TiO3. In: Journal of the American Ceramic Society, 103 (9). pp. 5259-5269.
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Abstract
The solid solution 0.5Ba(Ti0.8Zr0.2)O3 � 0.5(Ba0.7Ca0.3)T iO3 (BCZT) has become a promising member of the lead-free piezoelectric materials because of its exceptionally high piezoelectric properties. In this study, we focus on studying pressure-dependent Raman spectroscopy, powder x-ray diffraction, and dielectric constant measurements on BCZT. The data show several structural transitions are present, where the system from ambient mixed phase (tetragonal P4mm + orthorhombic Amm2) transforms into single phase (P4mm) at 0.3 GPa, then converts into cubic phase (Pm3m) at 4.8 GPa followed by another possible structural re-ordering around 10 GPa. Although there have been a lot of unanimity with the ambient crystallographic state of BCZT, our analysis justifies the presence of an intermediate orthorhombic phase in the Morphological Phase Boundary (MPB) of BCZT phase diagram. The transformation tetragonal to cubic is indicated by the Raman mode softening, unit cell volume change, and the (Ti/Zr)O6 octahedra distortion, which coincides with the well-known ferroelectric-paraelectric transition of the system. The sudden drop in the dielectric constant value at 4.7 GPa also confirms the loss of ferroelectric nature of the BCZT ceramic. © 2020 The American Ceramic Society
| Item Type: | Journal Article |
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| Publication: | Journal of the American Ceramic Society |
| Publisher: | Blackwell Publishing Inc. |
| Additional Information: | Copy right for this article belongs to Blackwell Publishing Inc. |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 04 Jan 2021 07:45 |
| Last Modified: | 04 Jan 2021 07:45 |
| URI: | http://eprints.iisc.ac.in/id/eprint/65372 |
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