铌酸锂晶体的暗电导研究  

Study on Electrical Conductivity of Lithium Niobate

作　　者：吴论生[1] 

机构地区：[1]重庆青年职业技术学院,重庆400712

出　　处：《西南师范大学学报（自然科学版）》2011年第6期24-27,共4页Journal of Southwest China Normal University(Natural Science Edition)

摘　　要：通过对不同组分比(Li/Nb)纯铌酸锂(LiNbO3)晶体电压和电流的测量,发现不同组分比晶体的电导率随温度变化而变化的程度不同.提出小极化子对电导率的作用机制,并分析了LiNbO3晶体中双极化子和小极化子对电导率的影响.最后对所测量的电导率进行拟合,得到了不同组分比晶体的激活能.The pure LiNhO3 crystals with different ratio Li/Nh are tested. Through the measurement of the voltage and the current, it is found that the conductivity of crystals with different Li/Nb ratio vary with temperature at different rate. Moreover, the mechanism of action of polaron on the conductivity is pro- posed and the influence of the bipolaron and polaron on the conductivity is analyzed. Finally, through fitting a curve to the conductivity measured, we get the activation energies of crystals with different ratio Li/Nb.

关 键 词：铌酸锂晶体 电导率 双极化子 小极化子 

分 类 号：O734[理学—晶体学]