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Raman spectra of GexAsySe1−x−y glasses

Wang, R. P.; Smith, A.; Prasad, A.; Choi, Duk-Yong; Luther-Davies, B.

Description

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...[Show more]

dc.contributor.authorWang, R. P.
dc.contributor.authorSmith, A.
dc.contributor.authorPrasad, A.
dc.contributor.authorChoi, Duk-Yong
dc.contributor.authorLuther-Davies, B.
dc.date.accessioned2015-12-22T00:07:47Z
dc.date.available2015-12-22T00:07:47Z
dc.identifier.issn0021-8979
dc.identifier.urihttp://hdl.handle.net/1885/95159
dc.description.abstractVarious 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.
dc.description.sponsorshipThis research was partly supported by the Australian Research Council through its Centres of Excellence and Federation Fellow Programs.
dc.publisherAmerican Institute of Physics (AIP)
dc.rightshttp://www.sherpa.ac.uk/romeo/issn/0021-8979..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 22/12/15). Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics and may be found at https://doi.org/10.1063/1.3204951
dc.sourceJournal of Applied Physics
dc.subjectKeywords: 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
dc.titleRaman spectra of GexAsySe1−x−y glasses
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume106
dc.date.issued2009-08-26
local.identifier.absfor091206
local.identifier.absfor020499
local.identifier.ariespublicationu9912193xPUB302
local.publisher.urlhttps://www.aip.org/
local.type.statusPublished Version
local.contributor.affiliationWang, Rongping, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Laser Physics Centre, The Australian National University
local.contributor.affiliationSmith, Anita, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Laser Physics Centre, The Australian National University
local.contributor.affiliationPrasad, Amrita, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Laser Physics Centre, The Australian National University
local.contributor.affiliationChoi, Duk-Yong, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Laser Physics Centre, The Australian National University
local.contributor.affiliationLuther-Davies, Barry, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Laser Physics Centre, The Australian National University
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage043520
local.identifier.doi10.1063/1.3204951
dc.date.updated2016-02-24T12:15:01Z
local.identifier.scopusID2-s2.0-69749101064
local.identifier.thomsonID000270083800035
CollectionsANU Research Publications

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