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Title: Suppressed dependence of polarization on epitaxial strain in highly polar ferroelectrics.

Abstract

A combined experimental and computational investigation of coupling between polarization and epitaxial strain in highly polar ferroelectric PbZr{sub 0.2}Ti{sub 0.8}O{sub 3} (PZT) thin films is reported. A comparison of the properties of relaxed (tetragonality c/a{approx}1.05) and highly strained (c/a{approx}1.09) epitaxial films shows that polarization, while being amongst the highest reported for PZT or PbTiO{sub 3} in either film or bulk forms (P{sub r}{approx}82 {mu}C/cm{sup 2}), is almost independent of the epitaxial strain. We attribute this behavior to a suppressed sensitivity of the A-site cations to epitaxial strain in these Pb-based perovskites, where the ferroelectric displacements are already large, contrary to the case of less polar perovskites, such as BaTiO{sub 3}. In the latter case, the A-site cation (Ba) and equatorial oxygen displacements can lead to substantial polarization increases.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
953806
Report Number(s):
ANL/MSD/JA-59216
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US201004%%565
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. Lett.; Journal Volume: 98; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; CATIONS; COUPLING; EPITAXY; FERROELECTRIC MATERIALS; OXYGEN; PEROVSKITES; POLARIZATION; PZT; SENSITIVITY; STRAINS; THIN FILMS

Citation Formats

Lee, H. N., Nakhmanson, S. M., Chisholm, M. F., Christen, H. M., Rabe, K. M., Vanderbilt, D., Materials Science Division, ORNL, and Rutgers Univ. Suppressed dependence of polarization on epitaxial strain in highly polar ferroelectrics.. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.98.217602.
Lee, H. N., Nakhmanson, S. M., Chisholm, M. F., Christen, H. M., Rabe, K. M., Vanderbilt, D., Materials Science Division, ORNL, & Rutgers Univ. Suppressed dependence of polarization on epitaxial strain in highly polar ferroelectrics.. United States. doi:10.1103/PhysRevLett.98.217602.
Lee, H. N., Nakhmanson, S. M., Chisholm, M. F., Christen, H. M., Rabe, K. M., Vanderbilt, D., Materials Science Division, ORNL, and Rutgers Univ. Mon . "Suppressed dependence of polarization on epitaxial strain in highly polar ferroelectrics.". United States. doi:10.1103/PhysRevLett.98.217602.
@article{osti_953806,
title = {Suppressed dependence of polarization on epitaxial strain in highly polar ferroelectrics.},
author = {Lee, H. N. and Nakhmanson, S. M. and Chisholm, M. F. and Christen, H. M. and Rabe, K. M. and Vanderbilt, D. and Materials Science Division and ORNL and Rutgers Univ.},
abstractNote = {A combined experimental and computational investigation of coupling between polarization and epitaxial strain in highly polar ferroelectric PbZr{sub 0.2}Ti{sub 0.8}O{sub 3} (PZT) thin films is reported. A comparison of the properties of relaxed (tetragonality c/a{approx}1.05) and highly strained (c/a{approx}1.09) epitaxial films shows that polarization, while being amongst the highest reported for PZT or PbTiO{sub 3} in either film or bulk forms (P{sub r}{approx}82 {mu}C/cm{sup 2}), is almost independent of the epitaxial strain. We attribute this behavior to a suppressed sensitivity of the A-site cations to epitaxial strain in these Pb-based perovskites, where the ferroelectric displacements are already large, contrary to the case of less polar perovskites, such as BaTiO{sub 3}. In the latter case, the A-site cation (Ba) and equatorial oxygen displacements can lead to substantial polarization increases.},
doi = {10.1103/PhysRevLett.98.217602},
journal = {Phys. Rev. Lett.},
number = 2007,
volume = 98,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}