Using the extended Landau-Devonshire theory, the paper deals with the effects of the stress upon the phase structures and ferroelectric stability of PbTiO 3 ultrathin films.

• 用推广的Landau Devonshire理论研究应力与尺寸效应对PbTiO3 铁电薄膜的相结构和稳定性的影响 .