|About this Abstract
||Materials Science & Technology 2012
||MS&T'12 Poster Session
||C18: Thermodynamic Study on PbxSr1-xTiO3 Ferroelectric Thin Films
||Liang Hong, Long-Qing Chen
|On-Site Speaker (Planned)
Thermodynamic phase diagrams on temperature-Sr concentration and temperature –mismatch strains were constructed for PbxSr1-xTiO3 ferroelectric thin films. At room temperature, there was a phase transition between tetragonal and cubic around Sr concentration of 50%, and the rhombohedra phase worked as a bridging one. The dielectric constants were maximized at the transition point which is consistent with experimental results. Under small compressive strains (-0.005), the transition point would move to Sr concentration of 63%. When Sr volume was low, i.e. Pb70Sr30TiO3, there had a narrow space that rhombohedra was stable surrounded by tetragonal and aa phases at small tensile strains. This area has some similarities to the MPB of PZT and other relaxors, where several polarization states may coexist and large strains will be realized with the easy rotation of dipoles.
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