Factors contributing to the local polar-structural heterogeneity and ultrahigh piezoelectricity in Sm-modified Pb(Mg1/3Nb2/3)O3-PbTiO3

Kumar, N and Mishra, A and De, A and Shankar, U and Ranjan, R (2020) Factors contributing to the local polar-structural heterogeneity and ultrahigh piezoelectricity in Sm-modified Pb(Mg1/3Nb2/3)O3-PbTiO3. In: Journal of Physics D: Applied Physics, 53 (16).

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Abstract

Recently, an ultrahigh piezoelectricity (longitudinal piezoelectric coefficient d 33 � 1500 pC/N) was reported in polycrystalline specimens of Sm-modified relaxor ferroelectric system Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) (Li et al 2018 Nat. Mater. 17 349). Here, we examine the factors associated with this anomalous phenomenon by carrying out a comparative structural, dielectric, ferroelectric and impedance spectroscopy on Sm-free 0.71PMN-0.29PT (piezoelectric coefficient d 33 � 380 pC/N) and its Sm modified counterpart (d 33 � 1160 pC/N). We found that, apart from inducing a Cm � P4mm inter-ferroelectric instability, Sm modification stabilizes a considerable degree of oxygen vacancies, with Sm exhibiting valence fluctuation. Based on our results, we argue that these defect types are the important source for creating structural-polar heterogeneity on the local scale, the interaction of which with the long-range ferroelectric order makes the system exhibit an ultrahigh piezoelectric response. © 2020 IOP Publishing Ltd.

Item Type:	Journal Article
Publication:	Journal of Physics D: Applied Physics
Publisher:	Institute of Physics Publishing
Additional Information:	All the copyright belongs to Publishers.
Keywords:	Crystallography; Ferroelectric materials; Ferroelectricity; Lead titanate; Piezoelectric devices, Ferroelectric instability; Impedance spectroscopy; Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT); Piezoelectric coefficient; Polycrystalline specimen; Relaxor ferroelectric; Structural heterogeneity; Ultrahigh piezoelectric response, Piezoelectricity
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	28 Nov 2024 06:24
Last Modified:	28 Nov 2024 06:24
URI:	http://eprints.iisc.ac.in/id/eprint/65049

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