Abstract
Nickel and manganese (Ni–Mn) co-doped with tin oxide (Sn(2–(x + y)) NixMnyO2) nanoparticles were synthesised by a sol-gel method. The influence of dopant concentration on prepared samples is investigated by different analytical techniques including X-ray diffraction (XRD), vibrating sample magnetometer, diffuse reflectance spectra, scanning electron microscope (SEM) and transmission electron microscope (TEM) to study the structural, optical and magnetic properties. The XRD study reveals that the formation of single-phase rutile tetragonal structure of all the samples and also the particle size vary from 8 to 6.5nm. The lattice constant and crystallite size are decreased as the (Ni–Mn) codoped with SnO2 and found to decrease with increasing doping concentrations. Magnetic measurements show that the (Ni–Mn)-doped SnO2 exhibit room temperature ferromagnetism. SEM and TEM are used to study the external morphology and particle size of the prepared sample.
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