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Measurement of High Resistance of Ferroelectrics

Lei Deming Shen Wenbin Yu Yansheng Leng Shuyan Li Jingde (Department of Physics,Zhongshan University)  
A lock-in amplifier method is given for the measurement of high resistance offerroelectric single crystals.The transmitting current is apart from the pyroecletriccurrent which is much larger than the former,so as to be able to give the bodyand surface resistance of a crystal plate with single- or multi-domain.Using thisamplifier,the body resistance measurements were performed on c-cut multi-domainsingle crystal of LN in the temperature range of 0 to 160℃.Near room tempera-ture,the body resistivity exhibits an anomalous maximum.The result strongly sup-ports that the carriers in LN are polarons.The resistivity also exhibits a relaxationeffect when the temperature is not too high.
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