This paper is dedicated to a study of conductivity and current-voltage characteristics (IV curve) of lithium niobate (LN, LiNbO₃) single crystals. The studied crystals have been turned to a single domain state. We have researched nominally pure congruent (CLN) and strongly doped LiNbO₃:Mg and LiNbO₃:Zn crystals at Т = 300–450 K. Magnitude, activation energy and type of conductivity have been established in CLN, LiNbO₃:Mg and LiNbO₃:Zn in the temperature range Т = 300–450 K. Coercive field in LiNbO₃:Mg and LiNbO₃:Zn crystals is much lower than in CLN. However, we have determined that nonlinearity of IV curve exists in CLN crystals and is absent from LiNbO₃:Mg and LiNbO₃:Zn crystals at temperatures up to 450 K and external electric field strength up to 12 kV/mm. The paper suggests possible explanation for the observed effects.

本文致力于研究铌酸锂（LN，LiNbO ₃）单晶的电导率和电流-电压特性（IV曲线）。研究的晶体已经变成单畴状态。我们已经研究了名义纯净（CLN）和强掺杂的LiNbO ₃：Mg和LiNbO ₃：Zn晶体，Т  = 300–450K。CLN，LiNbO ₃：Mg和LiNbO的幅值，活化能和导电类型已经确定₃：锌的温度范围内Т  = 300-450 K.矫顽场中的LiNbO ₃：Mg和的LiNbO ₃：Zn晶体远低于CLN。但是，我们确定CLN晶体中存在I V曲线的非线性，而LiNbO ₃：Mg和LiNbO ₃：Zn晶体在温度高达450 K和外部电场强度高达12 kV / mm时是不存在的。该论文为观察到的效果提出了可能的解释。