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Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 26: Ultra-fast phenomena

HL 26.11: Talk

Wednesday, March 14, 2018, 12:15–12:30, EW 202

Where are the "relaxors" and what are they doing? — •Wolfgang Donner1, Florian Pforr1, Kai-Christian Meyer1, Marton Major1, Karsten Albe1, and Uwe Stuhr21Technische Universität Darmstadt, Germany — 2Paul Scherrer Institut, Switzerland

We report on the nano-scale structure and picosecond dynamics of Ba-doped sodium bismuth titanate piezoelectrics. We used diffuse neutron scattering and a combination of Molecular Dynamics Simulation (MD) and Quasi-Elastic Neutron Scattering (QENS) to identify the origin of the frequency-dependence of the dielectric permittivity ("relaxor-behavior") in these materials. Despite the ps-range of the MD and QENS investigations, we assume that also lower frequency ranges of the permittivity are affected by the dynamics of the 20 nm sized tetragonal platelets which we identify as the "relaxors".

References: PRB 94, 014105 (2016), PRB 96, 184107 (2017)

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