期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 448, 期 -, 页码 123-129出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2017.06.098
关键词
Sintering; Microstructure; Ferrites nanoparticle; Mossbauer spectroscopy
资金
- Sasol Pty Ltd
- NRF of South Africa
Nano-crystalline Zn-, Co-, and Ni-substituted Mn-Mg ferrites were prepared by hydrothermal process and annealed at 1100 degrees C. Annealing conditions are critical on the crystalline phase. TEM and XRD data reveal particle sizes between 8 nm and 15 nm for the as-prepared fine powders, which increase to about 73 nm after sintering at 1100 degrees C. Mossbauer spectra show well resolved magnetic splitting in bulk samples. The as-prepared fine powders show weak hyperfine splitting and broad central doublets associated with fine particles. Magnetization data reveal a high coercive field at about 300 K of about 945 Oe in the Co-based nanosized oxide, which reduces to about 360 Oe after thermal annealing at 1100 degrees C. The magnetization curves of Zn- and Ni-based samples show much lower coercive fields indicative of superparamagnetic nanoparticles. The crystallite size and chemical composition have significant effects on the properties of Mn0.1Mg0.2(Zn, Co, Ni)(0.7)Fe2O4 investigated. (C) 2017 Elsevier B.V. All rights reserved.
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