Study of structural and dielectric properties of La0.9Na0.1CrO3- and Ni0.5Cu0.5Fe2O4-based composites

Abstract

The preparation of [Formula: see text][Formula: see text]CrO3 (LNCO), [Formula: see text][Formula: see text]Fe2O4 (NCFO) and their composites of the type [Formula: see text] [Formula: see text][Formula: see text]CrO3 (LNCO) [Formula: see text] ([Formula: see text]) [Formula: see text][Formula: see text]Fe2O4 (NCFO) [Formula: see text], 0.50[Formula: see text] through solid state route is reported. From X-ray diffraction data analysis, the parent [Formula: see text][Formula: see text]CrO3 was found to crystallize in orthorhombic structure (Pnma) while [Formula: see text][Formula: see text]Fe2O4 has crystallized into the cubic structure (Fd3[Formula: see text]) further verified via Retvield refinement. The morphology and compositional studies were carried out using field emission scanning electron microscopy (FESEM) and energy dispersive analysis of X-rays (EDAX), respectively. Lattice structure was confirmed via Raman characterization for the prepared samples. The sample formation was further verified through Fourier transform Infra-Red (FTIR) spectroscopy. The dielectric studies reveal the [Formula: see text][Formula: see text]CrO3[Formula: see text] and [Formula: see text][Formula: see text]Fe2O4[Formula: see text] exhibit high dielectric constant. However, their composites show abrupt drop in dielectric constant. The electric modulus study confirmed that the samples exhibit non-Debye character with spread of relaxation time constants.