| Title |
Implications of acceptor doping in the polarization and electrocaloric response of 0.9Pb(Mg1/3Nb2/3)O-3-0.1PbTiO(3) relaxor ferroelectric ceramics / |
| Authors |
Bradeško, Andraž ; Vrabelj, Marko ; Fulanovic, Lovro ; Svirskas, Šarūnas ; Ivanov, Maksim ; Katiliūtė, Ringailė Marija ; Jablonskas, Džiugas ; Šimėnas, Mantas ; Usevičius, Gediminas ; Malic, Barbara ; Banys, Jūras ; Rojac, Tadej |
| DOI |
10.1039/d0tc05854h |
| Full Text |
|
| Is Part of |
Journal of materials chemistry C.. Cambridge : Royal Society of Chemistry. 2021, vol. 9, iss. 9, p. 3204-3214.. ISSN 2050-7526. eISSN 2050-7534 |
| Keywords [eng] |
ferroelectric ; electromechanical ; electrocaloric response |
| Abstract [eng] |
In ferroelectrics, the effects of acceptor doping on electrical and electromechanical properties, often referred to as the "hardening" effects, are commonly related to domain-wall pinning mechanisms mediated by acceptor-oxygen-vacancy defect complexes. In contrast, the hardening effects in relaxor ferroelectric materials are complicated by the nano-polar nature of these materials, the associated dynamics of the polar nano-regions and their contribution to polarization, and the characteristic freezing transition between the ergodic and the non-ergodic phases. To shed light on this issue, in this study, we investigate the role of the acceptor (Mn) doping on the temperature-dependent broadband dielectric permittivity, high-field polarization-electric-field (P-E) hysteresis and electrocaloric (EC) response of 0.9Pb(Mg1/3Nb2/3)O-3-0.1PbTiO(3) (PMN-10PT) relaxor ferroelectric ceramics. The results suggest strong pinning effects, mediated by the acceptor-oxygen-vacancy defect complexes, which manifest similarly both in the ergodic and in the non-ergodic phases of PMN-10PT as revealed by the doping-induced suppression of the frequency dispersion of the permittivity maximum and pinched high-field hysteresis loops. In addition to these pinning effects, the Mn doping reduces the freezing temperature (T-f) by similar to 50 degrees C with respect to the undoped PMN-10PT. This is reflected in the EC response, which becomes less temperature dependent, making defect engineering a valuable approach for designing EC materials with an extended operational temperature range. |
| Published |
Cambridge : Royal Society of Chemistry |
| Type |
Journal article |
| Language |
English |
| Publication date |
2021 |
| CC license |
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