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  • 1
    Electronic Resource
    Electronic Resource
    Effect of addition of Au on the physical, electrical and optical properties of bulk glassy As2S3 (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5625-5632 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bulk glasses in the (As0.4S0.6)100−xAux system have been prepared by melt-quenching in air. Homogeneous glasses were limited in composition up to 0.5 at. % Au and precipitation of pure Au particles was observed above 0.5 at. %. The physical properties have been studied and compared with those of Ag-doped bulk glasses. The compositional trends of the density, Vickers hardness, and glass-transition temperature were found to be significantly different between the Au and Ag systems. The optical gap and activation energy of the Au-doped glasses were less than those of the Ag-doped glasses with the same dopant concentration. The Au atoms incorporated into As2S3 glass are suggested to be located in and/or between the As–S network and behave as neutral atoms or form some weak bond with surrounding S atoms, in contrast to Ag atoms that break up the network through the formation of Ag—S ionic bonds. An increase in the randomness of the As–S network structure with the addition of Au may mainly affect the electronic band structure of the Au-doped glasses. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363613
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  • 2
    Electronic Resource
    Electronic Resource
    Optical, electrical, and structural properties of amorphous Ag–Ge–S and Ag–Ge–Se films and comparison of photoinduced and thermally induced phenomena of both systems (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 9096-9104 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To understand the nature of Ag-rich chalcogenide glasses, the optical, electrical, and structural properties of evaporated amorphous (Ge0.3S0.7)100−xAgx and (Ge0.3Se0.7)100−yAgy films have been examined and compared with each other over a wide compositional range in Ag content. The maximum Ag content for the amorphous films was 67 at. % for the S-based system and 40 at. % for the Se-based system. The physical properties of both systems depended significantly on the Ag content but the compositional trends resembled each other. All the photoinduced and thermally induced phenomena observed for the S-based system were also observed for the Se-based system but with the compositional ranges shifted to lower Ag concentration: the photo- and thermal bleachings (0≤y〈22 for the Se-based system, 0≤x〈40 for the S-based system), the photoinduced surface deposition (PSD) of metallic Ag phenomenon, and the phase separation on annealing (25〈y≤40, 50〈x≤67). The Se-based system was found to exhibit the PSD phenomenon at low Ag concentrations where the S-based system never exhibits this effect. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362644
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Die Chemie des nicht-kristallinen Zustands (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 98 (1986), S. 31-46 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Feststoffe, die weitgehend fehlgeordnet sind - nicht-kristalline oder amorphe Stoffe - haben besondere chemische und physikalische Eigenschaften. Ein Schlüssel zum Verständnis des Verhaltens solcher Materialien ist die Kenntnis ihrer Nahordnung. Unser heutiges Wissen über nicht-kristalline Systeme stammt aus vielen Quellen, z. B. Rötgenbeugungsexperimenten, EXAFS-Spektren, MAS-NMR-Untersuchungen und Modellstudien. So läßt sich der Übergang zwischen flüssigem und glasartigem Zustand, der bei Unterkühlung einer Flüssigkeit auftritt, z. B. anhand von thermodynamischen Modellen oder Clustermodellen diskutieren. Die Fehlordnung wirkt sich auch auf die elektronischen Eigenschaften aus; neue Entwicklungen tragen zum Verständnis der Elektronen-Lokalisierung an topologischen Fehlstellen und von Transportprozessen bei. Als Anwendungsbeispiel seien Lichtleitfasern für Kommunikationsnetze genannt; superionenleitende Gläser dürften sich für Festkörperbatterien eignen.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19860980104
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  • 4
    Electronic Resource
    Electronic Resource
    The Chemistry of the Noncrystalline State (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 25 (1986), S. 31-46 
    Details
    ISSN: 0570-0833
    Keywords: Noncrystalline state ; Amorphous materials ; Disorder ; Solids ; Glass transition ; Glasses ; Materials science ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This article sets out to describe and account for the chemical and physical consequences of the presence of gross disorder in solids. Knowledge of the structure of such disordered materials is an obvious prerequisite to a further understanding of other properties and behavior, and our current knowledge of the structure of various noncrystalline systems is discussed together with the experimental techniques which need to be employed in order to obtain such information. The so-called glass transition, which takes place as a liquid is supercooled below the crystallization temperature, is discussed in terms of the various models which have been proposed to account for this phenomenon. The effect of noncrystallinity on electronic properties is also discussed, and we highlight new developments in the understanding of electron localization and transport processes. Finally, two applications of amorphous solids are considered in some detail: optical fibers for use in communication networks and “superionic” glasses for possible use in solid-state batteries.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198600311
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