Ukrainian Journal of Physical Optics

Number 4, Volume 2, 2001

Optical absorption edge anomalies at superionic phase transition in Cu₆PSe₅Br crystals
Studenyak I.P., Kovács Gy.Sh., Panko V.V., Mitrovcij V.V., Mykajlo O.A., Stefanovich V.O.

Institute of Solid State Physics and Chemistry, Uzhhorod National University, 46 Pidhirna St., 88000 Uzhhorod, Ukraine

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Temperature behaviour (77–320 K) of optical absorption edge in Cu₆PSe₅Br superionic crystals is studied. The spectral and temperature behaviour of the absorption edge is described by the Urbach rule. In the range of the first-order superionic phase transition the anomalous behaviour of the absorption edge parameters is revealed. The results of temperature isoabsorption studies are analyzed.

Keywords: Superionic conductor; phase transition; Urbach absorption edge.

doi 10.3116/16091833/2/4/165/2001

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