Regensburg 2019 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 10: Ferroics - Domains and Domain Walls

KFM 10.6: Talk

Tuesday, April 2, 2019, 10:45–11:00, H47

Interplay of domain structure and phase transitions and its impact on functional responses — •Anna Grünebohm¹ and Madhura Marathe² — ¹Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — ²Institut de Ciència de Materials de Barcelona, Spain

It is well established that the domain structure of ferroelectrics depends on crystal structure as well as the elastic and electric boundary conditions. However, the knowledge on the interplay of domain structure and structural phase transitions is incomplete. In this ab initio based study we focus on the domain structure at the tetragonal to orthorhombic phase transition in BaTiO₃ which has been less studied than the high temperature paraelectric to ferroelectric transition [1]. In particular, we show how domain engineering may allow to reduce the thermal hysteresis of the transition and how this allows to optimize functional responses such as the electrocaloric effect.

[1] T. Limboek and E. Soergel, Appl. Phys. Lett. 105, 152901, 2014