Evidence of monoclinic phase and its variation with temperature at morphotropic phase boundary of PLZT ceramics

Kumar, A and Kalyani, AK and Ranjan, R and Raju, KCJ and Ryu, J and Park, N and James, AR (2020) Evidence of monoclinic phase and its variation with temperature at morphotropic phase boundary of PLZT ceramics. In: Journal of Alloys and Compounds, 816 .

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Abstract

(Pb0.92La0.08)(Zr0.60Ti0.40)O3 referred to hereinafter as PLZT 8/60/40 ceramics, near the morphotropic phase boundary region, show the ultra-high piezoelectric properties. Several attempts have been made and the said properties were related with processing (The combinatorial approach of mechanical activation and cold isostatic pressing), density, microstructure and MPB, however, still more clarification is required. In this study, more detailed and elaborated structural analysis was done for PLZT 8/60/40 ceramics. Slow scan X-ray diffraction data were collected from room temperature to elevated temperature and analysed by Rietveld refinement method, which confirms the coexistence of two phases at MPB, instead of the previously reported single tetragonal phase. These two phases have the tetragonal (P4mm) and monoclinic (Cm) symmetries. This monoclinic phase was supposed to be responsible for the origin of ultra-high piezoelectric properties in PLZT 8/60/40 ceramics. The changes in both phases were also studied as a function of temperature. © 2019 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Ceramic materials; Crystal structure; Ferroelectric materials; Piezoelectricity; Pressing (forming); Structural ceramics, Cold isostatic pressing; Combinatorial approach; Monoclinic phase; Morphotropic phase boundaries; Piezoelectric property; Plzt; Rietveld refinement method; X-ray diffraction data, Rietveld refinement
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Feb 2023 09:38
Last Modified:	01 Feb 2023 09:38
URI:	https://eprints.iisc.ac.in/id/eprint/79688

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