PECULIARITIES OF COMPOSITIONAL DISORDERING IN Cu<sub>7</sub>(Ge<sub>1-x</sub>Si<sub>x</sub>)S<sub>5</sub>I SOLID SOLUTION CRYSTALS
DOI:
https://doi.org/10.24144/2415-8038.2014.36.37-40Keywords:
Solid solution, Absorption edge, Optical pseudogap, Urbach energyAbstract
Experimental results of spectral dependences of absorption coefficient in Cu7(Ge1-xSix)S5I. solid solution crystals are discussed. The compositional behavior of the Urbach absorption edge and their main parameters is studied. At cation Ge→Si substitution the nonlinear increase of optical pseudogap in Cu7(Ge1-xSix)S5I crystals is observed. The contributions of temperature, structural and compositional disordering in Urbach energy are determined.
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