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Elasticity Modulation Due to Polarization Reversal and Ionic Motion in the Ferroelectric Superionic Conductor KTiOPO4
journal contribution
posted on 2018-08-28, 00:00 authored by Gustav Lindgren, Anton Ievlev, Stephen Jesse, Olga S. Ovchinnikova, Sergei V. Kalinin, Rama K. Vasudevan, Carlota CanaliasThe
coupling between ionic degrees of freedom and ferroelectricity
has received renewed attention in recent years, given that surface
electrochemical processes have been shown to be intrinsically linked
to ferroelectric phase stability in ultrathin ferroelectric films.
However, the coupling between bulk ionic transport and local polarization
switching has received less attention, as typically the bulk ionic
mobilities are low for common ferroelectrics at room temperature.
Here, we use the coupled band-excitation method in conjunction with
site-correlated time-of-flight secondary ion mass spectrometry, to
determine the coupling between ferroelectric switching and ionic motion
in single crystal KTiOPO4. The local scanning probe measurements
indicate a substantial softening, as determined by resonant frequency
changes, during reversal of polarization along one direction. These
changes are correlated with the mass spectrometry measurements, showing
a polarization-dependent accumulation of K ions at the polar surfaces,
thus corroborating their role in the screening process. These studies
shed light on the interplay between ionic dynamics and bulk ferroelectric
switching and have implications for studies on domain wall conductivity,
chemical switching, and bulk and surface-screening phenomena.
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frequency changessurface electrochemical processesscreening processsite-correlated time-of-flightpolarization-dependent accumulationsurface-screening phenomenacrystal KTiOPO 4scanning probe measurementsband-excitation methodion mass spectrometryphase stabilityIonic MotionFerroelectric Superionic Conductor KTiOPO 4domain wall conductivityK ionsElasticity ModulationPolarization Reversalbulkroom temperaturemass spectrometry measurements
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