Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 26: Ultra-fast phenomena

HL 26.11: Vortrag

Mittwoch, 14. März 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 Stuhr² — ¹Technische 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)