The temperature and frequency dependences of the permittivity , the dielectric loss factor and the resistance R of the ceramic Ti in the interval 100-800 C were studied. A ferroelectric phase transition at temperature C was observed. Hysteresis loops typical for ceramic ferroelectrics were observed. Relaxation maxima of the dielectric loss factor in the temperature interval 150-300 C at various frequencies are formed. A value of 0.785 eV for the relaxation polarization activation energy was deduced. A strong low-frequency dielectric dispersion was observed. A relaxation maximum for the dielectric loss factor in the interval 10-50 kHz is formed. The activation energy of the conductivity depends on the frequency.
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Yordanov et al. (1998) studied this question.
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