Sinha, Subhojyoti and Chatterjee, Sanat Kumar and Ghosh, Jiten and Meikap, Ajit Kumar (2014) Electric modulus and impedance spectroscopy analysis on selenium nanoparticles at and above room temperature. In: 58th DAE Solid State Physics Symposium 2013, 17–21 December 2013, Thapar University, Patiala, Punjab, India.

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Here we report the electric modulus and impedance spectroscopy study on selenium nanoparticles in the temperature (T) range of 298K £ T £ 364K and in the frequency (f) of range 20Hz £ f £ 2MHz . Variation of the imaginary part of the electric modulus (M") with frequency yields well defined peaks (non–Debye type) which shift to higher frequency side with increasing temperature. From the response peaks of M" versus f graphs relaxation times (τ) are calculated which follows Arrhenius law with temperature with an activation energy of 0.27 eV. We observe that similar relaxation dynamics prevails at all temperatures with significant suppression of electrode effects. Role of grain and grain boundaries is also elucidated by the impedance spectroscopy analysis. We found that grain resistance varies from 0.07 M� to 0.48 M� whereas the grain boundary resistance varies in the range 0.09 M� to 0.82 M�. Both the grain and grain boundary resistances follow Arrhenius law with temperature having activation energies of 0.28 eV and 0.31 eV respectively. However both the grain and grain boundary capacitances exhibit weak temperature dependence.

Item Type: Conference or Workshop Item (Paper)
Subjects: Microstructure and Characterization
Depositing User: Bidhan Chaudhuri
Date Deposited: 20 Jul 2016 06:46
Last Modified: 20 Jul 2016 06:46

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