Synthesis and Characterization of LSMO-(BCT-BZT) Composites

The present paper reports synthesis and characterization of LSMO- (BCT-BZT) composites. yLSMO+ (1-y) [xBCT- (1-x) BZT] particulate composites are prepared for y = 0.1 & 0.175 and for x = 0.50. Ferrite La0.67Sr0.33MnO3 (LSMO) is synthesized via hydroxide co-precipitation route while ferroelectric composition [x (Ba0.7Ca0.3TiO3) - (1-x) (BaZr0.2Ti0.8O3)] (BCT-BZT) is synthesized via ceramic route, The crystal structures of LSMO, 0.50BCT- 0.50 BZT and LSMO- (0.50BCT-0.50BZT) are proved using X-ray diffractograms, while microstructures are proved using scanning electron microscope. The dielectric properties of composites are determined as a function of frequency in the range 100 Hz to 1 MHz. The dielectric constant () in case of yLSMO+ (1-y) [xBCT- (1-x) BZT] composites is expected to have two contributions, one due to parent (BCT-BZT) ferroelectric and other due to the interfacial polarization occurring at the interfaces between ferrite (LSMO) and ferroelectric (BCT-BZT) phases. To understand the observed behavior of in perspective of these models, the variation of loss tangent tan as a function of frequency are also determined in the same frequency range.