Abstract
GdMn1-xNixO3 (0 ≤ x ≤ 0.1) samples were synthesized by traditional solid state reaction method to understand the role of Ni substitution on structural, microstructural, electrical and magnetic properties. Powder X-ray diffraction data reveals the perovskite type structure with pnma space group for all the prepared samples. Scanning electron micrographs shows combined island and disc like granular structures. Raman spectroscopy reveals enhancement in asymmetric stretching mode due to out of phase MnO6 bending and bending mode due to O2 anti-stretching. The temperature dependent dc electrical resistivity confirms the semiconducting nature of the samples, supported by small polaron hopping (SPH) and variable range hopping (VRH) conduction models. The activation energies first increases and then decreases with Ni content. Temperature dependent magnetization under ZFC and FC regimes shows decrement in Tirr with Ni concentration. Currie-Weiss law fittings to inverse of susceptibility data indicates the paramagnetic nature of the samples with presence of antiferromagnetic interactions at 5 K.
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