Details

Autor(en) / Beteiligte

• Joshi, J.H.
• Kanchan, D.K.
• Joshi, M.J.
• Jethva, H.O.
• Parikh, K.D.

Titel

Dielectric relaxation, complex impedance and modulus spectroscopic studies of mix phase rod like cobalt sulfide nanoparticles

Ist Teil von

• Materials research bulletin, 2017-09, Vol.93, p.63-73

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •Mixed phase of CoS nanoparticles identified. Correlated Barrier Hopping conduction mechanism prevailing in CoS nanoparticles.•Binding energy and minimum hopping distance decrease as free carrier jump over barrier increases with temperature.•High value of density of state at Fermi level (∼1024) suggesting hopping between the pairs of sites.•M”max peak shift toward higher frequency with temperature suggesting correlation between motions of mobile ions.•Non-overlapping of Z” & M” with frequency suggesting existence of both from long range conductivity to localized relaxation. The Cobalt sulfide (CoS) nano-particles were synthesized using microwave assisted route. Powder XRD exhibited mixed phase of Co3S4 and CoS. The average crystallite size is found to be 58.28nm from the Scherrer’s formula and 54.41nm from the Williamson and Hall (W-H) method. Rod like morphology is observed in nano-particles by HRTEM. The EDAX spectrum confirmed the presence of cobalt and sulphur. The impedance spectra were recorded in the range from 10Hz to 10MHz at various temperatures from 323K to 373K. The complex impedance spectra, i.e., Nyquist plots, were composed of two semicircles indicating the presence of grain and grain boundary contributions of nanoparticles. From the Jonscher’s power law plots the Correlation Barrier Hopping (CBH) mechanism was found to prevailing for conduction in CoS nanoparticles. The electrical modulus spectroscopy suggested the temperature dependant relaxation process within CoS Nanoparticles. The results are discussed.