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Phase Diagram of the Relaxor Ferroelectric (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 Revisted: A neutron Powder Diffraction Study of the Relaxor Skin Effect

Published

Author(s)

Daniel Phelan, Efrain E. Rodriguez, J Gao, Y Bing, Z.-G. Ye, Qingzhen Huang, Jinsheng Wen, Guangyong Xu, C. Stock, M Matsuura, Peter M. Gehring

Abstract

We revisit the phase diagram of the relaxor ferroelectric PMN-xPT using neutron powder diffraction to test suggestions that residual oxygen vacancies and/or strain affect the ground state crystal structure. Powdered samples of PMN-xPT were prepared with nominal compositions of x=0.10, 0.20, 0.30, and 0.40 and divided into two identical sets, one of which was annealed in air to relieve grinding-induced strain and to promote an ideal oxygen stoichiometry. For a given composition and temperature the same structural phase is observed for each specimen. However, the distortions in all of the annealed samples are smaller than those in the as-grown samples. Further, the diffraction patterns for x=0.10, 0.20, and 0.30 are best refined using the monoclinic Cm space group. By comparing our neutron diffraction results to those obtained on single crystals having similar compositions, we conclude that the relaxor skin effect in PMN-xPT vanishes on the Ti-rich side of the morphotropic phase boundary.
Citation
Phase Transitions
Volume
88
Issue
3

Keywords

relaxors, PMN, PMN-xPT, phase diagram, morphotropic phase boundary, anomalous skin effect, powder diffraction, neutron scattering

Citation

Phelan, D. , Rodriguez, E. , Gao, J. , Bing, Y. , Ye, Z. , Huang, Q. , Wen, J. , Xu, G. , Stock, C. , Matsuura, M. and Gehring, P. (2015), Phase Diagram of the Relaxor Ferroelectric (1-x)Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3-x</sub>PbTiO<sub>3</sub> Revisted: A neutron Powder Diffraction Study of the Relaxor Skin Effect, Phase Transitions, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917580 (Accessed March 5, 2024)
Created January 18, 2015, Updated October 12, 2021