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Optimization of mechanical alloying parameters for synthesis of nanostructure hexagonal BaFe12O19

Optimization of mechanical alloying parameters for synthesis of nanostructure hexagonal BaFe12O19 In this study, barium hexaferrite nanostructure was synthesized by mechanical alloying method from a mixture of BaCO3 and Fe2O3. The effects of milling time and calcination temperature on synthesis of BaFe12O19 were investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM) were used to evaluation of structural, morphological, and magnetic properties of synthesized samples. The results showed that the amount of hematite phase increased by enhancing of the milling time from 5 to 25 h. However, the barium hexaferrite can be formed after 5 h milling and the calcination at 1100 °C. Also, the produced particles have almost spherical morphology and in some parts have polyhedral shape with an average size of about 100–150 nm. The saturation magnetization and the magnetic coercivity values were 56.48 emu/g and 5247.2 Oe, respectively. The area above the coercivity curve reveals that the sample has a hard magnetic behavior. In addition, the ratio of M r/M s was equal to 0.61 for the synthesized sample with the Fe/Ba molar ratio of 8. This amount is very close to the theoretical value for the random orientation of the single domain particles. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Australian Ceramic Society Springer Journals

Optimization of mechanical alloying parameters for synthesis of nanostructure hexagonal BaFe12O19

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References (52)

Publisher
Springer Journals
Copyright
Copyright © 2018 by Australian Ceramic Society
Subject
Materials Science; Ceramics, Glass, Composites, Natural Materials; Materials Engineering; Inorganic Chemistry
ISSN
2510-1560
eISSN
2510-1579
DOI
10.1007/s41779-018-0244-x
Publisher site
See Article on Publisher Site

Abstract

In this study, barium hexaferrite nanostructure was synthesized by mechanical alloying method from a mixture of BaCO3 and Fe2O3. The effects of milling time and calcination temperature on synthesis of BaFe12O19 were investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM) were used to evaluation of structural, morphological, and magnetic properties of synthesized samples. The results showed that the amount of hematite phase increased by enhancing of the milling time from 5 to 25 h. However, the barium hexaferrite can be formed after 5 h milling and the calcination at 1100 °C. Also, the produced particles have almost spherical morphology and in some parts have polyhedral shape with an average size of about 100–150 nm. The saturation magnetization and the magnetic coercivity values were 56.48 emu/g and 5247.2 Oe, respectively. The area above the coercivity curve reveals that the sample has a hard magnetic behavior. In addition, the ratio of M r/M s was equal to 0.61 for the synthesized sample with the Fe/Ba molar ratio of 8. This amount is very close to the theoretical value for the random orientation of the single domain particles.

Journal

Journal of the Australian Ceramic SocietySpringer Journals

Published: Aug 15, 2018

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