Raman spectra of GexAsySe1-x-y glasses

被引：47

作者：

Wang, R. P. ^{[1
]}

Smith, A. ^{[1
]}

Prasad, A. ^{[1
]}

Choi, D. Y. ^{[1
]}

Luther-Davies, B. ^{[1
]}

机构：

[1] Australian Natl Univ, Laser Phys Ctr, Res Sch Phys & Engn, Canberra, ACT 0200, Australia

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 106卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

SELF-ORGANIZATION; PHASE; TRANSITIONS; FRAGILITY;

D O I：

10.1063/1.3204951

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 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. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3204951]

引用

页数：2

共 22 条

[1] CORRELATIONS OF THE NONEXPONENTIALITY AND STATE DEPENDENCE OF MECHANICAL RELAXATIONS WITH BOND CONNECTIVITY IN GE-AS-SE SUPERCOOLED LIQUIDS [J].

BOHMER, R ;

ANGELL, CA .

PHYSICAL REVIEW B, 1992, 45 (17) :10091-10094

[2] Self-organization and the physics of glassy networks [J].

Boolchand, P ;

Lucovsky, G ;

Phillips, JC ;

Thorpe, MF .

PHILOSOPHICAL MAGAZINE, 2005, 85 (32) :3823-3838

[3] On the properties and stability of thermally evaporated Ge-As-Se thin films [J].

Bulla, D. A. P. ;

Wang, R. P. ;

Prasad, A. ;

Rode, A. V. ;

Madden, S. J. ;

Luther-Davies, B. .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2009, 96 (03) :615-625

[4] Ageing, fragility and the reversibility window in bulk alloy glasses [J].

Chakravarty, S ;

Georgiev, DG ;

Boolchand, P ;

Micoulaut, M .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2005, 17 (01) :L1-L7

[5] Raman-active modes of a-GeSe2 and a-GeS2:: A first-principles study [J].

Jackson, K ;

Briley, A ;

Grossman, S ;

Porezag, DV ;

Pederson, MR .

PHYSICAL REVIEW B, 1999, 60 (22) :R14985-R14989

[6] RAMAN AND IR STUDIES ON VIBRATIONAL PROPERTIES OF GE-SE GLASSES [J].

KUMAGAI, N ;

SHIRAFUJI, J ;

INUISHI, Y .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1977, 42 (04) :1262-1268

[7] Evidence for nanoscale phase separation of stressed-rigid glasses [J].

Mamedov, S ;

Georgiev, DG ;

Qu, T ;

Boolchand, P .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2003, 15 (31) :S2397-S2411

[8] TOPOLOGY OF COVALENT NON-CRYSTALLINE SOLIDS .1. SHORT-RANGE ORDER IN CHALCOGENIDE ALLOYS [J].

PHILLIPS, JC .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 1979, 34 (02) :153-181

[9]

Popescu M.A., 2001, Non-crystalline chalcogenicides

[10] Properties of GexAsySe1-x-y glasses for all-optical signal processing [J].

Prasad, Amrita ;

Zha, Cong-Ji ;

Wang, Rong-Ping ;

Smith, Anita ;

Madden, Steve ;

Luther-Davies, Barry .

OPTICS EXPRESS, 2008, 16 (04) :2804-2815

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