Ce,Y-TZP陶瓷的内耗峰和介电损耗峰机制

MECHANISM OF INTERNAL FRICTION AND DIELECTRIC LOSS PEAKS OF Ce,Y-TZP CERAMICS

测量了淬火前后8Ce,0.5Y-TZP陶瓷(稳定剂Y2O3的摩尔分数为0.50%)在室温到250℃温度范围内的内耗行为,并对出现的内耗峰机理进行了研究,发现淬火前后的样品在100℃左右均出现的内耗峰与YZr’V偶极子的再取向有关,而淬火后样品出现的高温内耗峰起源于马氏体相变。此外,本文还研究了8Ce,0.5Y-TZP和8Ce,0.75Y-TZP陶瓷在室温到400℃温度范围内的介电损耗,计算了介电驰豫的激活能,结果表明与内耗试验中机械驰豫的激活能一致。

The room temperature （RT） - 250℃ internal friction （IF） for quenched 8Ce, 0.5Y-TZP ceramics and RT-400℃ dielectric loss （DL） for 8Ce, 0. 5Y-TZP and 8Ce, 0.75Y-TZP ceramics were studied, Along with a relaxation peak, which is typical of normal 8Ce, 0. 5Y-TZP, two prominent IF peaks associated with phase transformation were observed in IF spectra for quenched 8Ce, 0.5Y-TZP. The activation energy is discovered to be identical for both the mechanical and dielectric relaxation. More evidences are found that reorientation of YZr, VOE anisotropic complexes formed by oxygen vacancies and substitutional yttrium ions were confirmed to be the origin of the relaxation peak of Ce, Y-TZP ceramics.