期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 502, 期 1, 页码 169-175出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.04.135
关键词
Composite materials; Chemical synthesis; Dielectric response; Oxidation; Thermal analysis; Electrochemical impedance spectroscopy
资金
- UGC-SAP
- DST-FIST, Government of India
- Indian Institute of Science
Nanocrystalline Fe powders were synthesized by transmetallation reaction and embedded in silica to form Fe-SiO2 nanocomposite. Thermomagnetic study of the as-prepared Fe sample indicates the presence of Fe3O4 and Fe particles. Oxidation studies of Fe and Fe-SiO2 show an increased thermal stability of Fe-SiO2 nanocomposite over pure Fe. The Fe-SiO2 shows an enhanced oxidation temperature (i.e., 780 K) and a maximum saturation magnetization value of (135 emu/g) with 64 wt.% of Fe content in silica. Electrical and dielectric behaviour of the Fe-SiO2 nanocomposite has been investigated as a function of temperature and frequency. Low frequency ac conductivity and dielectric constants were found to be influenced by desorptions of chemisorbed moisture. High saturation magnetization, thermal stability, frequency-dependent conductivity and low power loss make Fe-silica a promising material for high frequency applications. (C) 2010 Elsevier B.V. All rights reserved.
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