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基于热动力学理论,通过对演化方程的线性稳定分析,确定了1-3型BaTiO3-CoFe2O4(BTO-CFO)多重铁性复合材料中的铁电、铁磁相变温度.考虑系统中基底与薄膜之间及薄膜内铁电相、铁磁相之间的内应力和外应力的弹性耦合,确立了顺电到铁电/铁磁地相变临界温度地解析式.临界温度与两相体积分数、基底、薄膜的晶格尺寸、薄膜两相的材料性能及薄膜厚度都有很大关系.两相的相变临界温度可以通过调节体积分数及薄膜厚度进行控制.
Based on the thermodynamics theory, the ferroelectric and ferromagnetic transition temperatures of 1-3 type BaTiO3-CoFe2O4 (BTO-CFO) multi-iron composites were determined by the linear stability analysis of the evolution equation. The elastic coupling of internal stress and external stress between ferroelectric phase and ferroelectric phase in the film and between the film and the film, established the analytic formula of the critical temperature of the phase transition from ferroelectric to ferroelectric / ferromagnetic.The critical temperature and the two-phase volume fraction , The crystal lattice size of the substrate and the thin film, the material properties of the two phases and the thickness of the thin film, the critical temperature of the phase transition of the two phases can be controlled by adjusting the volume fraction and the film thickness.