The effect of doping crystals of tgs with some di- and trivalent ions on its: (ii) polarization and piezoelectricity

Abstract

The polarization, coercive field,piezoelectricity and electromechanical coupling for pure and doped single crystals of TGS arp investigated in the temperature range 77-325 K. The influence of the divalent ions Ni 2+, Cu2 and Co2 and the trivalent ions Cr34^ and Fe3'1' on the temperature of phase transition, the hysteresis loops of polarization and the seconed coefficient in the expansion of the free energy in powers of polarization is examined. The temperature dependence of the spontaneous polarization, coercive field and the piezoelectric and electromechanical coupling coefficients are studied and the results obtianed are compared. The existence of a new ferroelectric phase transition in the low temperature range is also discussed.