Abstract

The temperature dependence of dc steady state conductivity was measured in the three crystallographic directions for pure and y-irradiated TGS single crystals. An exponential law is obeyed from 20 to 80°C, with a change in activation energy at Tc. The electric conductivity is the highest along the c-axis. The three activation energies increase slowly with increasing defect concentration in the paraelectric state. In the ferroelectric phase, they increase initially up to about 0.5 MR and then decrease. Various radiation-induced changes in the three axes may suggest that the electric conductivity in TGS can vary in type from different crystallographic directions.

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