PZT陶瓷材料低温相变的内耗测量

INTERNAL FRICTION MEASUREMENT OF LOW- TEMPERATURE PHASE TRANSITIONS IN PZT CERAMICS

通过差热分析(DSC)、内耗以及Young’s模量等测量了PZT铁电陶瓷材料的相变行为.结果表明,在261和225 K各出现一个内耗峰.前者与DSC探测到的峰温一致,对应于从四方到单斜的一级相变;后者峰形不对称,对应的Young’s模量有突变,但在DSC上无反映,这可能与界面的运动有关,即与相变的稳态内耗有关.

A bulk thermodynamics study of lead zirconate titanate ferroelectric PbZr0.52Ti0.48O3 is performed through internal friction, Young's modulus and differential scanning calorimetry (DSC) measurements. Two internal friction peaks are observed near 261 K and 225 K. The former correlates with an enthalpy change revealed by DSC data and is ascribable to a first-order tetragonal to monoclinic phase transition. The latter (225 K), however, showing asymmetric line shape together with a dramatic decrease in Young's modulus, might correspond to a phase transition associated with the motion of domain walls.