Site occupancy and electric-field induced strain response of Er-doped (Bi0.4Na0.4Sr0.2)TiO3 ceramics

MCLAUGHLIN, Kerry, PASCUAL-GONZALEZ, Cristina, WANG, Dawei and FETEIRA, Antonio (2019). Site occupancy and electric-field induced strain response of Er-doped (Bi0.4Na0.4Sr0.2)TiO3 ceramics. Journal of Alloys and Compounds, 779, 7-14.

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© 2018 Elsevier B.V. Er-doped (Bi0.4Na0.4Sr0.2)TiO3 powders were prepared by solid state reactions according to A-site donor (Bi0.4-x/3Na0.4-x/3Sr0.2-x/3Erx)TiO3 (x = 0.0.015 and 0.02) and B-site acceptor (Bi0.4Na0.4Sr0.2)Ti1-yEryO3 (y = 0, 0.015 and 0.02) substitutional doping mechanisms. In both cases, room-temperature X-ray diffraction analyses revealed a decrease of the unit cell volume with increasing Er contents, suggesting A-site occupancy to be thermodynamically more favourable. Over the 25–175 °C temperature range, A-site doped ceramics, in particular x = 0.015, showed enhanced thermal stability of the maximum achievable electric-field induced strain. Importantly, this minor doping level also reduced dielectric loss at high temperature and led to a transition from non-ergodic to ergodic relaxor behaviour. These results may further motivate the study of the impact of other minor dopants in this family of Pb-free piezoceramics.

Item Type: Article
Uncontrolled Keywords: Erbium; Ceramics; Strain; Ferroelectric; Materials; 0912 Materials Engineering; 0914 Resources Engineering and Extractive Metallurgy; 0204 Condensed Matter Physics
Identification Number:
Page Range: 7-14
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 11 Oct 2019 10:10
Last Modified: 18 Mar 2021 02:17

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