Abstract
MnFe2O4 nanoparticles of various particle sizes were prepared by co-precipitation, in which different hydroxide concentrations were employed to control particle growth. X-ray diffraction and scanning electron microscopy were used to investigate the nanoparticle structure and morphology (shape and size). The particle size increased with increasing hydroxide concentration. The magnetization and coercivity field were measured by vibrating sample magnetometry. Changes in magnetic behavior were observed in the magnetic hysteresis loop curves of nanoparticles with increasing hydroxide concentration. In the absence of hydroxide, nanoparticles exhibited paramagnetic behavior. Increasing the hydroxide concentration caused a gradual conversion to ferrimagnetic behavior. An increased Néel temperature was observed with increasing hydroxide concentration, and the saturation magnetization exhibited a sharp decrease. Nonuniform hysteresis was observed in the magnetization curve for the sample prepared from hydroxide and ammonium.
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Acknowledgements
The authors appreciate Professor Arthur Yelon and Professor David Menard for their support and we thank the Magnetic Laboratory of École Polytechnique de Montreal, Department of Physics Engineering, Montréal, Canada, in which we carried out our magnetic measurements.
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Vaez-Zadeh, M., Mohammadi, A. Hydroxide Concentration Dependence of Magnetic Behavior at Low Temperature in MnFe2O4 Nanoparticles. JOM 66, 1345–1348 (2014). https://doi.org/10.1007/s11837-014-1024-x
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DOI: https://doi.org/10.1007/s11837-014-1024-x