Low temperature dc electrical conduction in reduced lithium niobate single crystals
Low temperature dc electrical conduction in reduced lithium niobate single crystals
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DOI：
10.1016/j.jpcs.2012.08.011
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发表时间：
2013
影响因子：
4
通讯作者：
A. Dhar;Nidhi Singh;R. Singh;Ramadhar Singh
中科院分区：
文献类型：
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作者：
A. Dhar;Nidhi Singh;R. Singh;Ramadhar Singh
在室温（~ 300 K）下测量了未还原和还原的铌酸锂（LiNbO_3）单晶的直流电导率。LiNbO 3单晶的直流电导率和激活能对氧还原程度有很强的依赖性。的直流电导率表现出一个峰值作为增加的氧还原度的函数。这些结果已被分析，假设小极化子跳跃传导之间的Nb 4+和Nb 5+离子网站。在77- 373 K温度范围内，研究了具有最高直流电导率的还原LiNbO_3单晶的直流电导率随温度的变化关系。所观察到的直流电导率数据进行了分析和解释莫特的可变范围跳跃（弗赫）导电模型涉及一个单一的声子跳跃过程。
The direct current (dc) electrical conductivity of unreduced and reduced lithium niobate (LiNbO3) single crystals has been measured at room temperature (∼300K). The dc conductivity and activation energy show strong dependence on the degree of oxygen reduction in LiNbO3single crystals. The dc conductivity exhibits a peak as a function of increasing degree of oxygen reduction. These results have been analysed assuming small polaron hopping conduction between Nb4+and Nb5+ion sites. The temperature dependence of dc conductivity of reduced LiNbO3single crystal, exhibiting the highest dc conductivity, has been examined in the temperature range 77–373K. The observed dc conductivity data has been analyzed and explained in terms of Mott’s variable range hopping (VRH) conduction model involving a single phonon hopping process.