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Phase transitions in the ferroelectric relaxor (1-x)Pb(Mg1/3Nb2/3) O3-xPbTi O3 close to the morphotropic phase boundary

Accepted version
Peer-reviewed

Type

Article

Change log

Abstract

Structural transformations of unpoled (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) single crystals (x=0.28 and x=0.32) were analysed by calorimetry and acoustic spectroscopy. The compositions are close to the morphotropic boundary (MPB). We find extended two-phase regions where cubic and rhombohedral (x=0.28), cubic and tetragonal, tetragonal and monoclinic phases (x=0.32) coexist during cooling and heating. The observed structural transitions in PMN-PT are first order, despite their proximity to the MPB. The predicted tricritical points, if they exist, are possibly located extremely close to the MPB.

Description

Keywords

40 Engineering, 4016 Materials Engineering, 34 Chemical Sciences

Journal Title

Physical Review Materials

Conference Name

Journal ISSN

2475-9953
2475-9953

Volume Title

Publisher

American Physical Society
Sponsorship
Engineering and Physical Sciences Research Council (EP/P024904/1)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (861153)