Investigation of thermal and electrical properties of As–Se glasses modified with Cu using DSC and AC impedance spectroscopy

• Published in: Applied physics. A, Materials science & processing Vol. 124; no. 12; pp. 1 - 7
• Main Authors: Šiljegović, M. V., Lukić Petrović, S. R., Sekulić, D. L., Štrbac, G. R., Skuban, F., Bošák, O., Petrović, D. M.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-12-2018; Springer Nature B.V
• Subjects: Applied physics; Characterization and Evaluation of Materials; Complexity; Condensed Matter Physics; Copper; Crystallization; Electrical properties; Electrical resistivity; Frequency ranges; Machines; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Polarization; Processes; Spectrum analysis; Surfaces and Interfaces; Thermodynamic properties; Thin Films
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-018-2289-7

Investigations of thermal properties of Cu
x
As
50
Se
50 − 
x
chalcogenides were carried out using a differential scanning calorimeter. It was established that copper introduction significantly affects the complexity of structural network. This was indicated by double-stage crystallization process in the compound Cu
15
As
50
Se
35
. Besides α relaxation, all the glasses during heating show β relaxation. The complexity of the network influences the conductivity values and transport properties in a way of higher
DC
and
AC
conductivity for the compound with the highest Cu share. Impedance spectra show two semicircles, indicating the existence of two polarization processes in different frequency ranges. The presence of kinetic and as well as diffusion processes in polarization of the samples with
x
 = 10 and 15 at% of Cu strongly affects the unusually high values of the real part of dielectric permittivity in low- and medium-frequency range.