Structure of germanium-selenium glasses: An x-ray-absorption fine-structure study

Journal Article · Tue Jan 15 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.2315· OSTI ID:6261281

Zhou, W; Paesler, M; Sayers, D E ^[1]

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1. Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202 (US)

X-ray-absorption fine-structure (XAFS) data in the binary chalcogenide glass system Ge{sub {ital x}}Se{sub 100{minus}{ital x}} system are presented and discussed. Phase-corrected Fourier transforms in a curved-wave XAFS simulation formalism are employed in analysis of the data, and near-edge structures are compared for the various compositions studied. Analysis of the XAFS data confirms the presence of chemical ordering. Least-squares-fitting results show that short-range order in the first shell is well preserved throughout the composition range studied. The coordination numbers for germanium and selenium (4 and 2, respectively) are unchanged for the composition 20{le}{ital x}{le}40. For {ital x}{le}33, there exist stable tetrahedral Ge(Se{sub 1/2}){sub 4} units that are connected by either double or single selenium atoms. For {ital x}{gt}33, Ge-Ge bonds appear, and the structure becomes more disordered compared to that of glassy GeSe{sub 2}.

• DOE Contract Number: FG05-89ER45384; AC02-76CH00016
• OSTI ID: 6261281
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:3; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ABSORPTION SPECTRA
ALLOYS
CHEMICAL BONDS
GERMANIUM ALLOYS
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
SELENIUM ALLOYS
SPECTRA
X-RAY SPECTRA