Synthesis and physical properties of the ferroelectromagnetic composites (1 − x )PbMn 1/3 Ta 2/3 O 3 –xPbTiO 3

In this paper, we present the synthesis and studies of physical properties of the ferroelectromagnetic composites (1–x)PbMn1/3Ta2/3O3–xPbTiO3 [(1–x)PMnT–xPT], which exhibit a relaxor behavior. Using a synergistic application of scanning electron microscopy (SEM), X-ray structure analysis, and energy-dispersive X-ray analysis (EDX), we revealed that two phases always coexist in the synthesis of the composition PbMn1/3Ta2/3O3 (PMnT), one phase of which has a pyrochlore structure, and the other has a pseudo-cubic cell of the perovskite structure. We further demonstrated that doping with lead titanate PbTiO3 (PT) suppresses the dielectric polarization’s relaxor behavior. Using X-ray diffraction techniques at room temperature, we studied the dependencies of the structural parameters of each phase on the mole fractions of PT. The dielectric characteristics were studied at various frequencies by the dielectric spectroscopy method, and the dependency of the bandgap Eg on the dopant’s mole fractions was determined by the optical absorption method. The dopant’s influence on the IR Fourier spectra and magnetic hysteresis loops was analyzed. The magnetodielectric and magnetoresistive effects in these composites were studied.