Volume 90, Number 2, April 2010
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 May 2010|
Finite-temperature atomic structure of 180° ferroelectric domain walls in PbTiO3
School of Civil and Environmental Engineering, Georgia Institute of Technology - Atlanta, GA 30332, USA
Corresponding author: email@example.com
Accepted: 15 April 2010
In this letter we obtain the finite-temperature structure of 180° domain walls in PbTiO3 using a quasi-harmonic–lattice dynamics approach. We obtain the temperature dependence of the atomic structure of domain walls from 0 K up to room temperature. We also show that both Pb-centered and Ti-centered 180° domain walls are thicker at room temperature; domain wall thickness at T = 300 K is about three times larger than that of T = 0 K. Our calculations show that Ti-centered domain walls have a lower free energy than Pb-centered domain walls and hence are more likely to be seen at finite temperatures.
PACS: 75.60.Ch – Domain walls and domain structure / 77.80.Dj – Domain structure; hysteresis
© EPLA, 2010
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