Frequency dependent dynamical electromechanical response of mixed ionic-electronic conductors

 
A. N. Morozovska,
 
S. L. Bravina,
 
Francesco Ciucci,
 
G. S. Svechnikov,
 
Long-Qing Chen,
 
S. V. Kalinin
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Journal of Applied Physics - Melville, USA: American Institute of Physics, 2012, #111
http://www.materials.kiev.ua/article/657

Abstract

Frequency dependent dynamic electromechanical response of the mixed ionic-electronic conductor film to a periodic electric bias is analyzed for different electronic and ionic boundary conditions. Dynamic effects of mobile ions concentration (stoichiometry contribution), charge state of acceptors (donors), electron concentration (electron-phonon coupling via the deformation potential), and flexoelectric effect contribution are discussed. A variety of possible nonlinear dynamic electromechanical responses of mixed electronic ionic conductors (MIEC) films including quasi-elliptic curves, asymmetric hysteresis-like loops with pronounced memory window, and butterfly-like curves are calculated. The electromechanical response of ionic semiconductor is predicted to be a powerful descriptor of local valence states, band structure and electron-phonon correlations thatcan be readily measured in the nanoscale volumes and in the presence of strong electronic conductivity.