四方衬底上BST薄膜的相图及介电特性

基于相变的热力学理论，数值模拟了单畴BST薄膜在四方结构衬底上的相图，并讨论了其介电特性．研究表明，与立方衬底上的相图相比较，该种情况下的BST相图较为复杂，并有新的铁电相出现．另外，其介电特性的分析表明在相界点部分极化强度分量是不连续的．

Phase Diagrams and Dielectric Properties of Epitaxial BST Thin Films on Tetragonal Substrates

Based on the thermodynamic theory of phase transition, the phase diagrams of single-domain BST thin films on tetragonal substrates are numerical simulated. Also, their dielectric properties are investigated. In contrast with the diagrams of BST thin films on cubic substrates, the result indicates that the diagrams of them are complex and exhibit some novel ferroelectric phases. Furthermore, the analysis of dielectric properties shows that some polarization components are discontinuous at the phase boundaries.