采用低频倒置扭摆内耗仪对组分为Pb(Zr0.7Ti0.3)O3(PZT73)和Pb(Zr0.3Ti0.7)O3(PZT37)的两种陶瓷的内耗Q－1及振动频率的平方f2（正比于材料的剪切模量G）与温度的关系进行了测定。在纯三角相的PZT73陶瓷中发现两个内耗峰。高温内耗峰PM起源于材料的顺电－铁电相变,低温内耗峰P1本质上是一个宽化的Debye峰，可归因于氧空位作用下的畴壁振荡弛豫。对纯四方相的PZT37陶瓷，除了P1和PM峰外，在P1与PM峰之间另有内耗峰P2，这与900畴附近的氧空位团簇的弛豫有关,其特征可用描述强关联系统的关联态模型（Couplingmodel）描述。
The internal friction Q－ 1 and the square of vibration frequency f 2(proportional to shear modulus G) were measured as a function of temperature on undoped Pb(Zr0.7Ti0.3)O3 (PZT73) and Pb(Zr0.3Ti0.7) O3 (PZT37) ceramics from 200C to 5000C. Experiments were performed on an inverted torsion pendulum at low frequencies (1～ 5Hz) .Two internal friction peaks were found in pure rhombohedral PZT73 ceramics. The high temperature peak PM, which appears at the Curie temperature, originates from the para－ ferroelec－tric phase transition. The low temperature peak P1 is a broadened Debye peak in nature, and it is contri－buted to the oscillation damping of the domain walls locked by the oxygen vacancies. For the pure tetrago－nal PZT37 ceramics, another peak P2,which appears between P1 and PM,can be well described by the coup－ling model. It is thought to be related with the relaxation of oxygen vacancy clusters near the 900 domains.
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