Impedance Spectroscopy of Fe-Doped SnO2 Synthesized by Poly(ethyleneglycol) Assisted Chemical Co-Precipitation Method
Pure and Fe-doped SnO2 powders were synthesized by chemical route method using polyethylene glycol. For the impedance study the samples are pelletized. The crystallite size is reduced with increasing concentration of Fe and is about 7 nm for Sn0.94Fe0.06O2
as per X-ray diffraction (XRD) data. Transmission electron microscopy image agrees with the XRD results and the particles are observed to be spherical in shape. The doping concentration is confirmed by energy dispersive X-ray spectroscopy. Impedance study was carried out in the temperature
range starting from room temperature to 200 °C with a frequency range of 20 Hz to 100 KHz. The results showed that the sample exhibits temperature and frequency dependent electrical properties. The sample displayed different AC conductivity behaviour for temperature ranging from room temperature
to 60 °C, and that from 80 °C to 200 °C in the case of the doped sample and is governed by Joncher's law. At lower temperature AC conductivity drops with increase of temperature whereas at temperature above 80 °C AC conductivity increases with temperature. The overall conduction
process is attributed to the hopping mechanism of the charge carriers and the results obtained are explained with the aid of overlapping large polaron tunneling (OLPT) model. Also an equivalent circuit is suggested from where the significance of grain and grain boundary is highlighted.
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Document Type: Research Article
National Institute of Technology Meghalaya, Shillong 793003, Meghalaya, India
Tezpur University, Napaam, Tezpur 784028, Assam, India
Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
National Institute of Technology Silchar, Silchar 788010, Assam, India
Publication date: August 1, 2017
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