Steady state conductivity vs. temperature was measured for Pb5(Ge,Si)3O11 mixed crystals and, moreover, for TGS and LAS pure and deuterated crystals. Change in activation energy at Tc was observed with activation energy in the ferroelectric phase higher than in the paraelectric phase. In case of TGS the second change in activation energy at low temperatures was found with low temperature activation energy close to those of the paraelectric phase.
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Połomska et al. (1981) studied this question.