SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 1: Focus: Domains and Domainwalls in (Multi)Ferroics I
KFM 1.6: Vortrag
Montag, 27. März 2023, 11:15–11:35, POT 51
The role of interfacial stress on the polarization stability of lead-free relaxor ceramics — •Julia Glaum1, 2, Yooun Heo2, Matias Acosta3, Pankaj Sharma2, Jan Seidel2, and Manuel Hinterstein2,4 — 1NTNU, Trondheim, Norway — 2UNSW Australia, Sydney, Australia — 3TU Darmstadt, Darmstadt, Germany — 4KIT, Karlsruhe, Germany
The unique structural, dielectric and electromechanical properties displayed by canonical relaxor systems, make these materials fascinating objects for fundamental studies as well as for industrial applications. Contributors to these unique properties are the multiple crystallographic phases present simultaneously even in individual grains, as well as the ferroelectric-relaxor phase transformation, which can become reversible in the vicinity of the transition temperature.
Here, we report on the thermal evolution of the crystallographic phases in a (Bi1/2Na1/2)TiO3-BaTiO3 relaxor ceramic. This system exhibits two polar phases, with the minority phase embedded into the majority phase. While the majority phase retains a stable poling state with increasing temperature up to the transition to the relaxor state, a gradual de-texturization of the poling state is observed for the minority phase over the whole temperature range. The surface domain structure decays already at significantly lower temperatures than expected from bulk observations. Development of interfacial stresses between majority and minority phases and differences in local stress state between surface and bulk are discussed as driving factors of the phase transition dynamics.