Raman spectra of Gex Asy Se1-x-y glasses

R. P. Wang; A. Smith; A. Prasad; D. Y. Choi; B. Luther-Davies

doi:10.1063/1.3204951

Raman spectra of Ge_x As_y Se_1-x-y glasses

R. P. Wang, A. Smith, A. Prasad, D. Y. Choi, B. Luther-Davies

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

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 T_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^-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 Ge₂ Se_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.

Original language	English
Article number	043520
Journal	Journal of Applied Physics
Volume	106
Issue number	4
DOIs	https://doi.org/10.1063/1.3204951
Publication status	Published - 2009

Access to Document

10.1063/1.3204951

Cite this

@article{20329a7c6ba44c0bb55a62aae74d4b0b,

title = "Raman spectra of Gex Asy Se1-x-y glasses",

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 Ge2 Se6/2. The increase in the scattering from these defects is an important factor leading to enhanced optical loss in the glasses with high MCN.",

author = "Wang, {R. P.} and A. Smith and A. Prasad and Choi, {D. Y.} and B. Luther-Davies",

year = "2009",

doi = "10.1063/1.3204951",

language = "English",

volume = "106",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

number = "4",

}

TY - JOUR

T1 - Raman spectra of Gex Asy Se1-x-y glasses

AU - Wang, R. P.

AU - Smith, A.

AU - Prasad, A.

AU - Choi, D. Y.

AU - Luther-Davies, B.

PY - 2009

Y1 - 2009

N2 - 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 Ge2 Se6/2. The increase in the scattering from these defects is an important factor leading to enhanced optical loss in the glasses with high MCN.

AB - 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 Ge2 Se6/2. The increase in the scattering from these defects is an important factor leading to enhanced optical loss in the glasses with high MCN.

UR - http://www.scopus.com/inward/record.url?scp=69749101064&partnerID=8YFLogxK

U2 - 10.1063/1.3204951

DO - 10.1063/1.3204951

M3 - Article

SN - 0021-8979

VL - 106

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 4

M1 - 043520

ER -

Raman spectra of Ge_x As_y Se_1-x-y glasses

Abstract

Access to Document

Other files and links

Fingerprint

Cite this