Pseudo-relaxor behavior in 0.35La(2)O(3)-0.65Nb(2)O(5) glass prepared by aerodynamic levitation method
Pseudo-relaxor behavior in 0.35La(2)O(3)-0.65Nb(2)O(5) glass prepared by aerodynamic levitation method
复制标题
气动悬浮法制备0.35La(2)O(3)-0.65Nb(2)O(5)玻璃的赝弛豫行为
DOI：
10.1016/j.materresbull.2016.02.032
复制
发表时间：
2016
影响因子：
5.4
通讯作者：
Ma Xiaoguang
中科院分区：
文献类型：
--
作者：
Zhang Zhanpei;Li Haibo;Wang Chunchang;Li Jianqiang;Ma Xiaoguang
采用空气动力悬浮法制备了0.35La_2O_3−和0.65Nb_2O_5玻璃。在100−到1 MHz的频率范围内，研究了样品的介电性能随温度(30℃和700℃)的变化。该玻璃的介电常数在200℃以下与温度和频率无关，在200℃以上表现为类弛豫行为，发现由两个弛豫组成，低温弛豫激活能为1.32EV，高温弛豫激活能为1.3EV。阻抗分析表明，低温驰豫是与氧离子跃迁运动有关的传导驰豫，高温驰豫是与相边界有关的Maxwell-Wagner驰豫。这种松弛的行为归因于这两种松弛的共同作用。
0.35La2O3− 0.65Nb2O5glasses were prepared by aerodynamic levitation method. The dielectric properties of the sample were investigated as a function of temperature (30 − 700 °C) in the frequency range from 100 Hz to 1 MHz. The glasses show a temperature and frequency-independent dielectric constant of ∼40 below 200 °C. A relaxor-like behavior was observed above 200 °C, which was found to be composed of two relaxations with the activation energy of 1.32 eV and 1.3 eV for the low- and high-temperature relaxations, respectively. Impedance analysis reveals that the low-temperature relaxation is a conduction relaxation associated with hopping motion of oxygen ions and the high-temperature one is a Maxwell-Wagner relaxation associated with phase boundary. The relaxor-like behavior is attributed to the combining effect of both relaxations.