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https://doi.org/10.1016/0167-577x(92)90145-a
Copy DOIJournal: Materials Letters | Publication Date: Nov 1, 1992 |
Citations: 2 |
The dependence of the glass-transition temperature ( T g ), Urbach-tail slope (Δ), and optical gap ( E 03) on the chemical composition in As-Se-Te glasses has been studied. It was found that both T g and Δ are compositionally invariant, while E 03 increases with increasing selenium content. It is supposed that softening of the studied glasses is controlled by the strength of the As-As bonds, a fraction of which is compositionally invariant. Similarly the As-As bonds broken during glass formation are supposed to be responsible for frozen-in potential fluctuations giving rise to the Urbach tail. Hence the As-As bonds and broken As-As bonds control both T g and Δ, which were found interrelated Δ ≈ 1.3 K B T g . On the other hand, the optical gap is controlled by anion substitution, and the E 03( x) dependence can be calculated using the virtual crystal model (VCM). The bowing parameter calculated using VCM has been found to be γ = 0.54 eV, in good agreement with experiment.
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