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Temperature Dependent RF Impedance in Ni Nanocrystalline Powders

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The RF impedance of nanocrystalline Ni (nc-Ni), and oxygen stabilized Ni (OS-Ni), nano crystalline powders are measured at 1 MHz as a function of temperature. Nanocrystalline Ni particles are obtained by ball milling technique while OS-Ni particles are synthesized via a chemical route and followed by annealing at 400 °C for 1 hour. The impedance of OS-Ni system is almost independent of temperature and an order of magnitude less than the nc-Ni powders. In contrast to the OS-Ni particulate powders, the RF impedance of pure Ni nano powders shows clear linear temperature dependence. The results are analysed in terms of classical electrodynamics.

Document Type: Short Communication


Publication date: 2010-09-01

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