Raman spectra of GexAsySe1−x−y glasses
Date
2009-08-26
Authors
Wang, R. P.
Smith, A.
Prasad, A.
Choi, Duk-Yong
Luther-Davies, B.
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American Institute of Physics (AIP)
Abstract
Various Ge–As–Se glasses spanning a mean coordination number (MCN) from 2.2 to 2.94 have been investigated using differential scanning calorimetry and Raman spectroscopy. The glass transition temperature Tg was found to increase with increasing MCN, except for those glasses located within the nanoscale phase-separated region of the phase diagram. The evolution of Raman features at wavenumbers from 150 to 350 cm⁻¹ exhibits two transitionlike features. Merging of the 225 and 250 cm⁻¹ modes at MCN=2.5 is a symbol of the extinction of Se–Se bonds. Additionally, the appearance of two modes at 280–290 and 170 cm⁻¹ at MCN>2.7 come from the defect modes of ethanelike Ge₂Se₆/₂. The increase in the scattering from these defects is an important factor leading to enhanced optical loss in the glasses with high MCN.
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Keywords: Defect mode; Glass transition temperature; Mean coordination numbers; Nano scale; Raman feature; Raman spectra; Separated region; Wave numbers; Differential scanning calorimetry; Germanium; Glass; Phase diagrams; Raman scattering; Raman spectroscopy; Glas
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Journal of Applied Physics
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