Raman spectra of Ge{sub x}As{sub y}Se{sub 1-x-y} glasses

Journal Article · Sat Aug 15 04:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3204951· OSTI ID:21361783

Wang, R P; Smith, A; Prasad, A; Choi, D Y; Luther-Davies, B ^[1]

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1. Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200 (Australia)

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 T{sub g} 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{sup -1} exhibits two transitionlike features. Merging of the 225 and 250 cm{sup -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{sup -1} at MCN>2.7 come from the defect modes of ethanelike Ge{sub 2}Se{sub 6/2}. The increase in the scattering from these defects is an important factor leading to enhanced optical loss in the glasses with high MCN.

• OSTI ID: 21361783
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 106; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ARSENIC COMPOUNDS
ARSENIC SELENIDES
CALORIMETRY
CHALCOGENIDES
COORDINATION NUMBER
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIAGRAMS
GERMANIUM COMPOUNDS
GLASS
INFORMATION
LASER SPECTROSCOPY
NANOSTRUCTURES
PHASE DIAGRAMS
PHYSICAL PROPERTIES
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
SPECTRA
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE