In this paper, xPbTiO 3 /(1-x)NiFe 2 O 4 (PTO/NFO, x = 0.1, 0.2, 0.3, 0.4 and 0.5) ceramic composites were prepared by mixing of sol-gel synthesized PTO and NFO powders, followed by their uniaxial pressing and sintering at 1150°C. The effects of PTO/NFO composition on crystal structure, surface morphology, electrical, magnetic and magnetoelectric coupling properties were studied. XRD results showed that the prepared ceramics contain only PTO and NFO phases without any impurity phase. The samples were relatively dense while the grains were evenly distributed. The dielectric constant and loss varied monotonically with the frequency for different molar ratios. The hysteresis loop of the composites with high amount of high resistance NFO phase (x = 0.1, 0.2) has the shape characteristic for a material with large leakage current. The samples with x = 0.1 showed the largest saturated magnetization, while the sample with x = 0.2 had the maximum remnant magnetization. It was also shown that the polarization was affected by the external magnetic field of 1 mT and the strongest ME coupling (relative polarization change of 15.4%) was observed for the 0.5PbTiO 3 /0.5NiFe 2 O 4 composite. In addition, the relevant calculation showed that the leakage mechanism may not be the main factor affecting the polarization of the obtained ceramics.
In this paper, barium ferrite powders were synthesized by sol-gel method, calcined at different temperatures,
and on this basis the corresponding ceramics were prepared. The effects of calcination temperature on the
structure, magnetic, dielectric and multiferroic properties of BaFe12O19 ceramics were studied. XRD results
confirmed similarity between powders and ceramics, where dominant phase is BaFe12O19 and a small amount
of an apparent BaFe2O4 impurity phase was formed at lower calcination temperature. The impurity BaFe2O4
phase is the main reason for decreasing powder magnetization. The maximum dielectric constant of 100
(at 10 kHz) and maximum remanent polarization, remanent magnetization and saturation magnetization of
0.46 ?C/cm2, 47.37 emu/g and 79.96 emu/g, respectively, were obtained in the barium ferrite ceramics prepared
from the powder calcined at 1100?C. This research could be the basis for the study of single-phase multiferroic
materials and the development of multi-order electronic devices.
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