Abstract
MnxZn1-xFe2O4nanoparticles having cubic spinel phase were synthesized through chemical sol–gel method. The results showed a linear increase in crystallite size, lattice constant, packing factor, and number of unit cells per sample with x, following Vegard's law. High specific surface area (20.34–34.35 m2/g) has been observed which shows suitability for energy storage applications. Magnetic propertieswere improved, likely due to the blocking state of tiny nanoparticles. Switching in direct (4.26–5.12 eV) and indirect (3.03–4.63 eV) bandgaps and Urbach energy was observed at x = 0.5. Refractive index showedtunable trend against incident wavelength making the system a potential candidate for hetero-lasers and non-linear optics. Nyquist plot revealed a non-Debye relaxation phenomenon and the contribution of grain boundaries and grains. Variations in dispersion energy (2.61–30.49 eV), excitation energy (8.44–10.25 eV), optical spectrum moments (M−1: 0.3047 to 2.9757, M−3: 0.0041 to 0.0283 eV−2), and high frequency dielectric constants (1.30–3.98)have been observed.
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