1. Effect of sintering temperature on magnetic and electrical properties of nano-sized Co2W hexaferrites
- Author
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Ahmad, Mukhtar, Ali, Ihsan, Aen, Faiza, Islam, M.U., Ashiq, Muhammad Naeem, Atiq, Shabbar, Ahmad, Waheed, and Rana, M.U.
- Subjects
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SINTERING , *TEMPERATURE effect , *NANOSTRUCTURED materials , *FERRITES , *CARBON dioxide , *BARIUM compounds , *GELATION , *ELECTRIC properties of materials - 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]
- Published
- 2012
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