Abstract
The quasistatic linear and nonlinear dielectric constants εs in lead magnesium niobate (PMN [111] and PMN [001]) crystals were investigated by means of the charge accumulation technique. The zero-field-cooled and field-cooled static susceptibilities show a crossover from a nonergodic relaxor to inhomogeneous ferroelectric behavior. At electric fields above the critical value contribution from the saturated spontaneous polarization was observed. The temperature dependence of the total third order nonlinear response was also determined along both axis.
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