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Effect of sintering temperature on magnetic and electrical properties of nano-sized Co2W hexaferrites
- Source :
-
Ceramics International . Mar2012, Vol. 38 Issue 2, p1267-1273. 7p. - Publication Year :
- 2012
-
Abstract
- Abstract: Nano-sized and single phase W-type hexaferrite (BaCo2Fe16O27) powders synthesized by sol–gel autocombustion method have been investigated. The samples were sintered in a temperature range of 1000–1200°C for 5h. The thermal decomposition behavior of as-prepared powder was studied by thermogravimetry (TG), differential thermal analysis (DTA) and infrared spectra (IR). The structural and magnetic properties of powders were investigated by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The grain size calculated by Scherer equation was found in the range of 36–47nm which is small enough to obtain a suitable signal-to-noise ratio in high density recording media. Hysteresis loop measurements show that the coercivity values lie in the range of 210.61–1602.6Oe with increasing sintering temperature. Magnetization studies show a significant increase in the values from 15 to 22emu/g. The dc electrical resistivity is observed to decrease up to a certain value as the temperature increases and then rises at higher temperature. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 38
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 69954418
- Full Text :
- https://doi.org/10.1016/j.ceramint.2011.08.059