Single-phase polycrystalline Bi[Formula: see text]Ho[Formula: see text]Sm[Formula: see text]FeO3 ceramic is prepared by conventional solid state route. The co-doping of Sm and Ho (via Bi site) in BiFeO3 controls the formation of secondary phases. The Rietveld refinement analysis shows an increasing trend in tilt angle due to the rotation of FeO6 octohedra with respect to host BiFeO3. The remanent polarization and the magnetization of Bi[Formula: see text]Ho[Formula: see text]Sm[Formula: see text]FeO3 ceramic are found to be significantly improved than BiFeO3 and Bi[Formula: see text]Sm[Formula: see text]FeO3 at room-temperature. Considerable variations in the remanent polarization (0.18 to 0.11 [Formula: see text]C/cm2) on magnetic poling and a dielectric anomaly in the vicinity of the antiferromagnetic transition temperature are due to the intrinsic magnetoelectric coupling effect in Bi[Formula: see text]Ho[Formula: see text]Sm[Formula: see text]FeO3 ceramic. The dielectric permittivity increases with increase in applied magnetic field and the coupling coefficient of Bi[Formula: see text]Ho[Formula: see text]Sm[Formula: see text]FeO3 ceramic is found to be 0.91% at 4 kOe.
K. An anomalous behavior in conductivity observed in the temperature range 263 to 283 K is reported and it is essentially due to the disordered structure of water molecules. The activation energy determined from the least squares analysis in the temperature range 278 to 303 K and 188 to 273 K are 0.38 and 0.15 eV respectively. The observed conductivity parameter results support the vehicle mechanism as the proton conduction mechanism in this single crystal. Using the Nernst-Einstein relation, the proton diffusion coefficient is calculated and found to be 1.29x10 -11 m 2 s -1 at room temperature. Steady state photoconductivity is measured at room temperature for various intensities and the material is found to be photosensitive. The variation of photocurrent with different illumination levels is found to be linear in these single crystals. The transient photoconductivity measurement shows that the photo-induced responses are moderate in the beginning and slow during decay process with respect to time.
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