Pressure effects on model ferroelectric BiFeO3-PbTiO3: Multiple phase transitions

Basu, Abhisek and Jana, Rajesh and Ranjan, Rajeev and Mukherjee, Goutam Dev (2016) Pressure effects on model ferroelectric BiFeO3-PbTiO3: Multiple phase transitions. In: PHYSICAL REVIEW B, 93 (21).

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Abstract

Pressure-dependent powder x-ray diffraction, Raman spectroscopy, and dielectric constant measurements are performed on 0.65 BiFeO3-0.35 PbTiO3. Four structural transitions are reported in 0-34 GPa range. The transitions are observed at 0.7(1), 0.8(1), 3.4(1), and 6.1(1) GPa, where the system transformed from ambient tetragonal P4mm to a mixed phase of tetragonal and rhombohedral (P4mm + R3c), followed by transition to rhombohedral R3c, cubic Pm3m and again to rhombohedral R3c structure, respectively. The transformation to the cubic structure coincides with the ferroelectric-paraelectric transition. Higher-pressure cubic-to-rhombohedral transition shows a slight softening of Raman modes along with an enhancement in spontaneous strain. The high-pressure rhombohedral phase shows signatures of another ferroic transition.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW B
Publisher:	AMER PHYSICAL SOC
Additional Information:	Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	25 Aug 2016 10:21
Last Modified:	25 Aug 2016 10:21
URI:	http://eprints.iisc.ac.in/id/eprint/54322

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