Dresden 2017 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 3: Focus: Ferroics with Mesoscopic Order

DF 3.2: Topical Talk

Montag, 20. März 2017, 10:00–10:30, WIL B321

Determining fundamental properties from diffraction: Electric field induced strain and piezoelectric coefficient — •Manuel Hinterstein^1,2, Markus Hoelzel³, Andrew Studer⁴, and Michael J. Hoffmann¹ — ¹Institut für Angewandte Materialien, Karlsruher Institut für Technologie, Haid-und-Neu Straße 7, 76131 Karlsruhe, Germany — ²School of Materials Science and Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia — ³Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany — ⁴Bragg Institute, Australian Nuclear Science and Technology Organization, Locked Bag 2001, Kirrawee DC NSW 2232, Australia

Piezoelectric ceramics exhibit the remarkable property to couple elastic strain and polarization. Especially actuators rely on high electric fields to generate high strains and forces. The two most important characteristics of this class of materials are macroscopic strain and piezoelectric coefficient. Despite extensive studies and elaborated measurement techniques, the correlation between macroscopic strain and structural response is still not fully understood. Most of the relevant systems found up to now are compositions close to phase boundaries linking highly correlated phases. Apart from the well-known field induced structural responses such as domain switching and the converse piezoelectric effect we recently identified field induced phase transitions in different systems as an additional poling mechanism. The results not only separately reveal the contributions of each poling mechanism to the macroscopic strain, but also different behaviours of the phases.