The results of the absorption edge study of some glasses based on CdAs₂ are discussed in terms of internal potential fluctuations. Both the electrostatic and deformation fluctuations are present in a-CdGeAs₂ whereas in remaining glasses only the former were observed. A qualitative description of the electronic properties of these glasses offers Boer's real-glass model. Its applicability limits are discussed. At elevated temperatures, the edges formally obey the Urbach rule. Possible reasons for this behaviour are considered.

Abstract

Die Ergebnisse des Studiums der Absorptionskante einiger Gläser auf CdAs₂-Basis werden mit Hilfe innerer Potential-Fluktuationen diskutiert. In a-CdGeAs₂ werden sowohl elektrostatische als auch elastische, in anderen Gläsern nur elektrostatische Fluktuationen beobachtet. Eine qualitative Beschreibung der elektronischen Eigenschaften dieser Gläser vermittelt das Böersche Modell des realen Glases. Seine Anwendungsgrenzen werden diskutiert. Bei höheren Temperaturen können die Kanten mit der Urbach-Regel formal beschrieben werden. Mögliche Ursachen fur dieses Verhalten werden diskutiert.

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Volume67, Issue2

1 February 1975

Pages 731-742

Optical absorption edge of CdAs₂-based glasses

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Optical absorption edge of CdAs₂-based glasses