中文摘要：

对La2Cu1-xZnxO4＋δ（0≤x≤0．2）系列样品的低频内耗和模量进行了研究．发现0≤x≤0．005时样品在低温存在两个弛豫内耗峰，分别是由样品中两种状态的额外氧跳跃弛豫引起的；当0．05≤x≤0．2时样品只存在一个内耗峰，该内耗峰可归于由共价氧对的额外氧跳跃引起，其峰位随掺杂量的增加向高温移动．不同掺杂量样品的模量曲线揭示高温处的模量反常对应着体系的正交一四方结构转变；此相变发生的温度随掺杂量的增加向高温移动．

英文摘要：

The low-frequency internal friction Q-1 and relative shear modulus M of La2Cu1-xZnxO4＋δ （0≤x≤0.2） compounds were studied. It was found that for 0≤x≤0. 005, there are two relaxation internal friction peaks around 200 K and 250 K, which are both due to the hopping of the excess O atoms; while for 0. 05≤x≤0. 2, only one relaxation peak exists around 250 K and this peak is due to the hopping of O pairs. The position of the structure phase transition revealed by shear modulus moves to higher temperature side with the increase of Zn content. In addition, the temperature of relaxation internal friction peaks also increases with the rise of Zn content.