Elasticity Modulation Due to Polarization Reversal and Ionic Motion in the Ferroelectric Superionic Conductor KTiOPO4

ACS Applied Materials & Interfaces
Gustav LindgrenCarlota Canalias

Abstract

The 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, ...Continue Reading

References

Jan 1, 1992·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·D T ChuR G Hunsperger
Mar 10, 2012·Physical Review Letters·Weida WuJ R Guest
Apr 15, 2014·Physical Review Letters·Kevin F GarrityDavid Vanderbilt
Jun 2, 2015·Nano Letters·Jilai DingNazanin Bassiri-Gharb
Nov 3, 2016·ACS Applied Materials & Interfaces·Anton V IevlevOlga S Ovchinnikova
Feb 28, 2017·Nano Letters·Zijian HongLong-Qing Chen
Oct 25, 2017·Advanced Materials·Qi ZhangNagarajan Valanoor

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