D. N. Tafen | Searcharxiv

arXiv2008

Intermediate Phase in Germanium-Selenide glasses: A Theoretical and Experimental Study

A theoretical and experimental study of the Intermediate Phase (IP) in GexSe1-x is presented. Based on ab initio molecular dynamics (MD) models of these glasses, a generic atomic picture of the IP is discussed thoroughly. X-Ray Absorption Near Edge Structure (XANES) measurements on Ge-Se glasses over a wide range including the IP window are presented to show the electronic signature of the IP in the form of the shift in the absorption edge with the Ge content. It is shown that MD based models clearly reproduce that shift.

cond-mat.dis-nn↗

arXiv2008

Electronic Signature of the Intermediate Phase in Ge_xSe_{1-x} Glasses: A Joint Theoretical and Experimental Study

Raman and calorimetric studies on Ge_xSe_{1-x} glasses have provided evidence for the existence of the intermediate phase (IP) in chalcogenide and other glasses. Here, we present X-Ray Absorption Near Edge Structure (XANES) measurements on germanium selenide glasses in the IP composition range, and detect an electronic signature of the IP. Ab initio molecular dynamics (MD) based models of these glasses are discussed, and an atomistic picture of the IP, based upon the models and available experiments is presented. We show that these models reproduce detailed composition-dependent structure in the XANES measurements, and otherwise appear to properly represent the structure of the GeSe glasses near the IP.

cond-mat.dis-nn↗