Structural, magnetic and dielectric relaxation behaviour study of La2MnCoO6 and fully substituted B-site La2FeCoO6

Abstract

ABSTRACTThe La2MnCoO6 (LMCO) and La2FeCoO6 (LFCO) double perovskite powder samples were synthesized by hydroxide co-precipitation method. It would be interesting to see the effect of complete B-site substitution in LMCO with Fe transition metal on the structural, magnetic and dielectric behaviour. The X-ray diffraction, M-T curve and M-H hysteresis loops were studied to estimate parameters, namely crystallite size, transition temperature and ferromagnetic behaviour of sample. The dielectric response, Bode plots and Nyquest plots of samples were recorded for frequency range from 10 kHz to 1 MHz at temperature range 30–125 °C. It is interesting to study the dielectric relaxation and complex impedance behaviour of samples due to bulk and intrinsic effect contribution. The conductivity analysis show that the activation energy Ea value is nearby 100 meV, which suggests the presence of nearest neighbour hopping conduction mechanism of charge carriers in samples.