Sadhana, K and Sandhya, R and Praveena, K (2015) DC-Bias-Superposition Characteristics of Ni0.4Zn0.2Mn0.4Fe2O4 Nanopowders Synthesized by Auto-Combustion. In: JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 15 (6). pp. 4552-4557.
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Ni0.4Zn0.2Mn0.4Fe2O4 nanopowders were prepared by auto-combustion method. The as-synthesized powders were characterized using X-ray diffraction (XRD) and thermo-gravimetric-differential thermal analysis (TG-DTA), and the powders were densified at different temperatures 400 degrees C, 500 degrees C, 600 degrees C and 700 degrees C/4 hrs using conventional sintering method. The sintered samples were characterized by XRD and transmission electron microscope (TEM). The bulk densities of the samples were increased with an increase of sintering temperature. The grain sizes of all the samples vary in between 18 nm to 30 nm. The hysteresis loops show high saturation magnetization and low coercivity, indicates that it is a soft material. The incremental permeability (permeability with magnetic field superposition) was influenced by both Delta M and H-c. A sample with higher initial permeability and favoured the attainment of a higher incremental permeability. The Q-factor was mainly determined by the sintered density and microstructure. To summarize, a uniform and dense microstructure with relatively small average grain size is favourable for obtaining better dc-bias-superposition characteristics, including permeability and Q-factor.
| Item Type: | Journal Article |
|---|---|
| Publication: | JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY |
| Publisher: | AMER SCIENTIFIC PUBLISHERS |
| Additional Information: | Copyright for this article belongs to the AMER SCIENTIFIC PUBLISHERS, 26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USA |
| Keywords: | Ferrites; Magnetic Properties; Permeability; Q-Factor; Dc-Bias-Superposition |
| Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
| Date Deposited: | 14 Feb 2015 13:32 |
| Last Modified: | 14 Feb 2015 13:32 |
| URI: | http://eprints.iisc.ac.in/id/eprint/50798 |
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