Influence of Mn doping on structural, electrical and magnetic properties of (0.90)BiFeO3–(0.10)BaTiO3 composite

Dielectric, electrical conduction and magnetic properties of multiferroic Bi0.8Tb0.1Ba0.1Fe0.9Ti0.1O3 perovskite compound

“…These type of two peaks has been observed in samples due to the high percentage of dopant ion (>5%). [20][21][22][23][24] With the increase in temperature, the dielectric constant rises up to 170 C and then decreases up to 235 C. After 235 C, dielectric constant increases again up to 320 C. The two maximum values of dielectric constant (" 1 max : and " 2 max : ) with two transition temperatures at different frequencies (1-100 kHz) are shown in Table 1. Figure 3 shows the variation of log ac (s=m) versus 1/T (K À1 ) of BTBFT ceramics at 1-100 kHz frequencies in the temperature range from 325 C to 345 C. The ac electrical conductivity was obtained from the impedance data using the formula ¼ !""…”

Dielectric and impedance spectroscopy of (Ba, Sm)(Ti, Fe)O3 system in the low-medium frequency range

“…At low frequency more energy is required for the motion of charge carriers, thereby, a higher resistance is offered by the grain boundaries, causing higher value of dielectric loss tangent. Similarly at high frequency low resistance is offered by grains, resulted in lower value of dielectric loss [20].…”

“…According to the Landau-Devonshire theory, dielectric anomaly observed at phase transitions in magneto electrical ordered system due to the influence of vanishing magnetic order on the electric order. Since there is a possibility of coupling in electric and magnetic orderings in the material, a change in magnetic ordering clearly affects the dielectric value [20][21][22]. Figure 4a, b shows the variation of tan d with temperature at low as well as intermediate frequencies.…”

Phase transitions in the (BaTiO3) /(BiFeO3)1− composite ceramics: Dielectric studies

“…To find magnetoelectrics with more appropriate parameters, many efforts were made to design various new multiferroics including ceramic materials, in particular, on the basis of BiFeO 3 (see, for instance, [7][8][9][10][11][12][13][14][15]). Spontaneous polarization and other properties were found to be changed remarkably in many such ceramic samples: substituted ceramics which composition can be written as Bi 1-x A x Fe 1-y B y O 3 [7,[9][10][11][12][13] and composite ceramics with composition xP/(1-x)BiFeO 3 [8,14,15]. A characteristic which influences strongly the magnetoelectric coupling in ceramics is the temperature of the antiferromagnetic phase transition.…”