Role of Grain and Grain Boundary on the Electrical and Thermal Conductivity of Bi0.9Y0.1Fe0.9Mn0.1O3 Ceramics.

Role of grain and grain boundary on electrical and thermal conductivity of Bi_0.9Y_0.1Fe_0.9Mn_0.1O₃ ceramic was investigated systematically. Tartaric acid modified sol gel method was used to synthesize the compound. X-ray diffraction technique was used to confirm the formation of single phase orthorhombic (Pbnm) structure. Electrical properties of the sample were measured with a wide frequency range from 100Hz to 10MHz at different temperature from 40°C to 250°C. AC impedance studies indicate the presence of grain and grain boundary effect. The negative temperature coefficient of resistance (NTCR) behaviour of the compound has been confirmed by the cole-cole plot. DC electrical and thermal conductivities of the compound were explained on the basis of grain and grain boundaries. [ABSTRACT FROM AUTHOR]