Synthesis of superparamagnetic Mn3O4 nanocrystallites by ultrasonic irradiation |
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Authors: | I.K. Gopalakrishnan N. Bagkar R. Ganguly S.K. Kulshreshtha |
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Affiliation: | Novel Materials and Structural Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India |
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Abstract: | Nanocrystalline Mn3O4 has been synthesized by ultrasonic irradiation of Mn acetate solution in water. Analysis of its X-ray diffraction data shows formation of a phase-pure compound with an average particle size of about 15 nm. DC magnetization measurements as a function of temperature and field show a reduced ferrimagnetic transition temperature as compared to those reported for the bulk , and a subsequent observation of superparamagnetic behavior at 40 K. The observed magnetic properties are suggestive of formation of a single domain magnetically ordered Mn3O4 nanoparticles below their ferrimagnetic transition temperature. |
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Keywords: | A1. Ferrimagnet A1. Superparamagnetism A1. Ultrasonic irradiation B2. Nanoparticles |
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