Physics – Condensed Matter – Materials Science
Scientific paper
2004-06-30
phys. stat. sol. (b), Vol. 241, Issue 11, 2004. P. R52-R55
Physics
Condensed Matter
Materials Science
7 pages, 4 figures, 1 table
Scientific paper
10.1002/pssb.200409054
The films of order-disorder type ferroelectrics were considered in the mean field approximation taking into account depolarization field. It was shown that size effects in this system could be described on the base of bulk system equation of state with Curie temperature dependent on the film thickness. The critical size hc and critical temperature Tc of phase transition from ferroelectric to paraelectric phase was calculated allowing for the depolarization field contribution. The comparison of the polarization dependence on the film thickness, temperature and electric field for the films of order-disorder and displacement type ferroelectrics is performed. In particular it was shown that all the dipoles become ordered at T=0 independently on the film thickness for h>hc contrary to the displacement type ferroelectrics. Critical thickness appeared larger and polarization distribution sharper for the displacement type ferroelectrics than for order-disorder type ferroelectrics.
Eliseev Eugene A.
Glinchuk Maya D.
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