Anomalous ultrasonic absorption in solid state ionic conductor

在KNa_<-y>（1.4）Zr_（1.3）Mg_（0.7）（PO_4）_3和Na_（2.4）Zr_（1.3）Mg_（0.7）（PO_4）_3之间制备了具有NASICON型结构的固溶体Na_yK_（1.4）Zr_（1.3）OMg_（0.7）（PO_4）_3。阳离子取代提高了电导率，其在y=0.7时达到最大值。对于每种组合物，活化能从阿氏曲线获得，并且相对于y显示相当恒定。用X射线衍射法测得了衍射参数a和c。参数a相当恒定，B对y的非线性行为。这些结果与结构特征和电导率数据相关。PbBr_2-CuBr固溶体具有高于150 ℃的高电导率。在x=0.01-0.3的浓度范围内，研究了复介电常数的频率和温度依赖性。它们表现出由离子导电引起的强介电弛豫。在30至200 ° C的温度范围内测量了超声吸收。根据浓度，它们在约170 ° C处显示出明显的峰。利用德拜弛豫理论解释了铜离子在两个位置之间的跃迁。

Solid solution Na_yK1_<-y>Na1.4Zr1.3OMgo0.7 (PO4) 3 was prepared between KNa1.4Zr1.3Mg0.7 (PO4) 3 and Na2.4Zr1.3Mg0.7 (PO4) 3 with NASICON type structure. Cationic subsitution improved the conductivity which reached a maximum for y=0.7. For each compositions, the activation energy was obtained from th Arrhenius plots, and showed fairly constant against y. Hexagonal parameters a and c were obtained by X-ray diffraction. The a parameter was fairly constant and the b nonlinear behavior against y. These results are correlated with structural features and conductivity data. The solid solution of PbBr2-CuBr has a high electric conductivity above 150ﾟC.The frequency and temperature dependences of complex dielectric constants have been investigated in the concentration of x=0.01-0.3. They exhibited a strong dielectric relaxation caused by the ionic conducrion. Ultrasonic absorption has been measured in the temperature range from 30 to 200ﾟC.They showed a distinct peak at about 170ﾟC depending on the concentration. Using the Debye relaxation, the excess absorption was explained as transition of copper ions between two sites.