Ionic transport in LiNbO_3
Ionic transport in LiNbO_3
复制标题
LiNbO_3 中的离子传输
DOI：
10.1557/jmr.1991.0851
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发表时间：
1991
影响因子：
2.7
通讯作者：
D. M. Smyth
中科院分区：
文献类型：
--
作者：
A. Mehta;E. K. Chang;D. M. Smyth
同组分LiNbO_3的高温平衡电导率(950°C-1050°C)可分解为两个组分：依赖于氧分压的电子部分和与压力无关的离子部分。结果表明，通过分析测得的总平衡电导率与氧分压的关系，可以得到这两个组分。将得到的离子输运数(分数离子电导率)与氧浓度计测量的离子输运数进行了比较。两种方法的一致性很好，证实了缺陷化学方法的实验有效性。根据电导率与温度的关系，得到了离子输运的活化能(138kJ/mol[1.43 eV])。计算结果与以前得到的氧化学扩散系数值符合得很好。
The high temperature equilibrium conductivity (950 °C–1050 °C) of congruent LiNbO_3 can be resolved into two components: an electronic portion that is dependent on the oxygen partial pressure and an ionic portion that is pressure independent. It is shown that the two components can be obtained from an analysis of the total equilibrium conductivity measured as a function of oxygen partial pressure. The ionic transport number (fractional ionic conductivity) thus obtained is compared with that obtained from an oxygen concentration cell measurement. The two techniques are found to be in excellent agreement, confirming the experimental validity of the defect chemistry method. From the temperature dependence of the ionic conductivity, the activation energy (138 kJ/mol [1.43 eV]) for the ionic transport is obtained. The results are in good agreement with the value previously obtained for the oxygen chemical diffusivity.