Carboxylate hydrazinate complex involving mixed metals have been synthesized and used as precursor for preparing the nanocrystalline Mn–Ni–Zn ferrite. Chemical composition of complex was fixed from chemical analysis results, infrared studies, thermogravimetric and differential scanning calorimetric analysis and isothermal weight loss studies. Nano-crystalline Mn–Ni–Zn ferrite particles obtained by thermal autocatalytic decomposition were characterized using X-ray diffraction studies, infrared spectral studies and TEM measurement. Two peaks in the region of 340–420 and 550–660 cm−1 observed in the infrared spectrum of “as synthesized” oxide are characteristics of spinel ferrites. Average particle size of “as synthesized” Mn–Ni–Zn ferrite was found to be 10 nm. “As synthesized” Mn–Ni–Zn ferrite showed Curie point at 313 °C. Saturation magnetization (44.7 emu/g) observed for “as synthesized” Mn–Ni–Zn ferrite is lower than bulk material which is indicative of its nano-crystalline nature. Seebeck coefficient measurement has shown that the material exhibits n-type semiconducting behavior.
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