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Effect of copper on DC and AC conductivities of (As2Se3)–(AsI3) glassy semiconductors

“…With the temperature increase, the frequency of the transition from a weak to marked dependence of lnσ tot (ω) (arrows in Figs. [6][7][8][9] is shifted to the range of higher frequencies. The AC component σ AC (ω,T) of total measured conductivity is found to have a strong frequency dependence in accordance with the relation σ AC (ω,T) = Aω s .…”

“…Bulk glassy materials of the system Cu x [(As 2 Se 3 ) 0.9 (AsI 3 ) 0.1 ] 100 − x (x = 0, 1, 5 and 10 at.%) were prepared from high-purity elemental substances (99.999%) by applying cascade heating regime and conventional melt quenching technique [8]. Amorphous character of the structures was confirmed by X-ray diffraction analysis at room temperature and by reflected-light polarization microscopy.…”

“…Thus, great variations of important glass characteristics appear as a result of introducing Cu, Ag or Cd atoms into the chalcogenide systems. It has been found that the presence of Cu in amorphous arsenic-selenides leads to the increase of density, microhardness [4], softening temperature and thermal stability [5,6], refractive index and to a decrease of the optical band gap [7], activation energy of electrical conductivity [8], as well as changing of the electrical switching properties of the glass to a definite direction [9]. In addition to the known good mechanical, thermal, magnetic and electrical properties, some investigations have been focused on the elucidation of the changes in optical features of copper-containing chalcogenide glasses.…”