Nonlinear Piezoelectricity in Epitaxial Ferroelectrics at High Electric Fields

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Alexei Grigoriev,¹ Rebecca Sichel,¹ Ho Nyung Lee,² Eric C. Landahl,³ Bernhard Adams,³ Eric M. Dufresne,³ and Paul G. Evans¹
¹Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA
²Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
³Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

Received 28 July 2007; published 18 January 2008

Nonlineareffects in the coupling of polarization with elastic strain havebeen predicted to occur in ferroelectric materials subjected to highelectric fields. Such predictions are tested here for a PbZr_0.2Ti_0.8O₃ferroelectric thin film at electric fields in the range ofseveral hundred MV/m and strains reaching up to 2.7%. Thepiezoelectric strain exceeds predictions based on constant piezoelectric coefficients atelectric fields from approximately 200 to 400 MV/m, which is consistentwith a nonlinear effect predicted to occur at corresponding piezoelectricdistortions.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.100.027604
DOI:	10.1103/PhysRevLett.100.027604
PACS:	77.65.-j; 68.37.Yz; 77.84.Dy; 78.47.-p 77.65.-j Piezoelectricity and electromechanical effects 68.37.Yz X-ray microscopy of surfaces, interfaces and thin films 77.84.Dy Dielectric, piezoelectric, and ferroelectric niobates, titanates, tantalates, PZT ceramics, etc 78.47.-p Spectroscopy of solid state dynamics YEAR: 2008