Compositional dependence of the optical parameters of Ge Sb40−Se60 glasses

Autor:	A. Szekeres, E. Savova, V. Pamukchieva, E. Vlaikova
Rok vydání:	1998
Předmět:	Chemistry business.industry Infrared Band gap Coordination number Physics::Optics Condensed Matter Physics Molecular physics Electronic Optical and Magnetic Materials Wavelength Optics Chemical bond Atom Materials Chemistry Ceramics and Composites Topological order business Refractive index
Zdroj:	Journal of Non-Crystalline Solids. 242:110-114
ISSN:	0022-3093
Popis:	The optical bandgap (Eg) and the complex index of refraction (N) in GexSb40−xSe60 glasses are studied by means of spectroscopic ellipsometry in the light wavelength region of 400 to 820 nm. The values of optical bandgap, Eg, and complex index of refraction, N, are considered as a function of the average coordination number (Z) of covalent bonds per atom. Their compositional dependences show changes in the vicinity of Z=2.67, which we associate with the topological phase transition, occurring when the predominantly two-dimensional layer structure (2D) changes to a three-dimensional (3D) network.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cfdf3cdce88e9e7d2ce7e671ead2299a https://doi.org/10.1016/s0022-3093(98)00794-7 Zobrazit plný text záznamu Full Text from ScienceDirect