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Dielectric and Magnetic Properties of Cr3+, Mn2+ & Fe3+ Doped BiNbO4 Ceramic Powders

Karuturi Srinivasa Rao and Srinivasa Buddhudu

We report here on the preparation, dielectric and magnetic of Bi0.95 TM0.05NbO4 (where TM = Cr3+, Mn2+ & Fe3+) ceramic powders with a sintering temperature of 8000C through solid state reaction method. Both SEM images and EDAX elemental profiles have been obtained to analyze their particle sizes and the chemical compositions. The XRD profiles of the samples are measured to understand their structure details. The dielectric properties of those samples have also been measured as function of frequency and their magnetic properties have also been studied to understand their magnetic nature. It is interesting to mention that the dielectric constant (ε’) and dielectric loss (tan δ) of all the samples have been found to be decreasing while ac conductivity (σac) increases as a function of frequency. The Cole-Cole plots of all the materials studied show the bulk resistance (Rb) decreasing with an increase in the crystallite sizes. The dc conductivity (σdc) results of the transition metal ions doped ceramic powders have shown the trend in the order of Mn < Cr < Fe that are in accordance with the literature reports. The present work thus documents more useful and interesting results.