内耗对SrxBa1-xSnO3钙钛矿相变孪晶动力学的影响
Effect of internal friction on transformation twin dynamics in SrxBa1-xSnO3 perovskite
摘要：
采用动态力学分析方法研究了钙钛矿结构SrxBa_（1-x）SnO_3（x= 0.6，0.8）中相变孪晶的动力学行为。这种材料在加热时经历从正交到四方和立方结构的相变。相变孪晶的机械损耗特征包括正交相和四方相中的弛豫和频率无关的峰，在立方相中没有观察到能量耗散。从弯曲能和各向异性能计算了双壁的宏观形状、取向和相对位移。根据畴壁的弯曲模式讨论了机械损耗角和弛豫时间的分布。
英文摘要：
The dynamics of transformation twins in SrxBa1-xSnO3 (x=0.6,0.8) perovskite has been studied by dynamical mechanical analysis in three-point bend geometry. This material undergoes phase transitions from orthorhombic to tetragonal and cubic structures on heating. The mechanical loss signatures of the transformation twins include relaxation and frequency-independent peaks in the orthorhombic and tetragonal phases, with no observed energy dissipation in the cubic phase. The macroscopic shape, orientation and relative displacements of twin walls have been calculated from bending and anisotropy energies. The mechanical loss angle and distribution of relaxation time are discussed in term of bending modes of domain walls.
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