Abstract
The linear and nonlinear complex dielectric constants of thedisordered lead scandium tantalate (Pb(Sc1/2Ta1/2)O3)relaxor system, which is characterized by B-site disorder, weremeasured. The linear dielectric susceptibility showed a typicalrelaxor behaviour which can be described by the Vogel-Fulcher lawand an additional weak dispersion which can be observed only at verylow frequencies. The temperature dependence of the third-harmonicresponse also showed a frequency dispersion, and the peaktemperatures of the real part obeyed the Vogel-Fulcher law with afreezing temperature close to that of the linear response. Theobserved nonlinear susceptibility showed a quite similar behaviourto that of lead magnesium niobate (Pb(Mg1/3Nb2/3)O3).The temperature variation is discussed on the basis of thetheoretical predictions of the spherical random-bond-random-fieldmodel (Pirc R and Blinc R 1999 Phys. Rev. B 6013 470) and a recent phenomenological model (Glazounov A E andTagantsev A K 2000 Phys. Rev. Lett. 85 2192).
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