Abstract
Dielectric permittivity, differential scanning calorimetry nonisothermal measurements, and hysteresis loops were performed for oriented (1−x)Pb(Mg1∕3Nb2∕3)O3–xPbTiO3 unpoled crystals. Two distinguished branches were obtained where spontaneous ferroelectric to relaxor or ferroelectric phase transition was observed within the peculiar relaxor to normal ferroelectric region. The percolating polar region induced by the addition of PbTiO3 tends to gradually develop comparable ferroelectric order changing slightly with temperature from the nonpolar matrix, associated with a weak first or first order phase transition. Small frequency dispersion due to relaxor polarization at or below transition temperature TFE-RorFE indicated the changes of ferroelectric multidomain and polar nanoregion in this disordered system.
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