期刊
FERROELECTRICS
卷 507, 期 1, 页码 86-101出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00150193.2017.1283554
关键词
Ultrathin ferroelectric; phase transition; phenomenology; surface effect; epitaxial constraint; depolarization effect
资金
- National Natural Science Foundation of China (NSFC)
- Program for New Century Excellent Talents in University (NCET)
Modified Landau-Ginzburg-Devonshire phenomenological theory was used to investigate the influence of substrate constraint, surface effect, and depolarizing field on Curie phase transition and critical size for ferroelectric instability in ultrathin PbTiO3 and BaTiO3. The calculated thickness dependence of transition temperature and polarization for epitaxial films on various substrates was compared with relevant experimental results, so as to evaluate the applicability of macroscopic phenomenology in ultrathin films. Our calculations of charge-compensated PbTiO3 and uncompensated BaTiO3 are essentially in reasonable agreement with the previous measurements.
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