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Synthesis and characterization of substituted barium hexaferrites for magnetic recording applications

Fine particles of non-stoichiometric BaFel2-2xNi0.63xZr0.5xO19-d for x=0.1 , 0.3, 0.5, 0.7, 0.9 and 1.0 and stoichiometric BaFel2-2xMexZrxO19 where Me=Co, Ni and Zn; x=O.I, 0.3, 0.5, 0.7, 0.9 and 1.1 substituted M type barium ferrite have been synthesized using the citrate gel route for possible application in magnetic recording. These samples have been characterized by high temperature and room temperature x-ray diffraction analysis, vibrating sample magnetometery, Mossbauer spectroscopy, ferromagnetic resonance and scanning electron microscopy to understand their structural, microstructural and magnetic behavior. Best magnetic and microstructural properties have been observed in case of non stoichiometric compositions (NNZ(x)). Single phase formation at a temperature as low as 700°C was possible due to presence of vacancies and a small excess of Ba2+ ions in NNZ(x) compositions. The particle size obtained in these samples was in the range of 100-400 A° indicating single domain particles. Amongst all the samples, the magnetization was highest in NNZ(x) compositions. More Info

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