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  • 1
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 497 (1983), S. 105-118 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Massenspektroskopische Untersuchung der Zersetzung und die Bildungsenthalpie von CuInS2(f)Die Gleichgewichtsverdampfung von CuInS2(f) wurde massenspektroskopisch nach der Knudsenmethode im Temperaturbereich 902 - 1110 K untersucht. Danach zersetzt sich CuInS2(f) unter Gleichgewichtsbedingungen nach der Redaktion 2 CuInS2(f) = Cu2S(f) + In2S(g) + S2(g). Während der anfänglich zeitabhängigen Verdampfung von CuInS2(f) verändern sich die beobachteten Ionenintensitäten von In2S+ und S2+, um nach einiger Zeit Gleichgewichtswerte anzunehmen. Aus den unter Gleichgewichtsbedingungen gemessenen Intensitäten als Funktion der Temperatur ergibt sich die Enthalpie der obigen Zersetzungsreaktion (2 Mole CuInS2) zu ΔH298° 630,9 = 26 kJ. Mit diesem Wert und zusätzlichen thermochemischen Daten wurde die Bildungsenthalpie des CuInS2(f), ΔH298,f° = -221,7 ± 13 kJ/mol, berechnet.
    Notes: The equilibrium vaporization of CuInS2(s) was studied by Knudsen cell mass spectrometric techniques in the temperature range 902 - 1110 K. Based on these and independent congruency studies, CuInS2(s) decomposes under steady-state conditions according to the reaction 2CuInS2(s) = Cu2S(s) + In2S(g) + S2(g). During the initial transient period of the vaporization of CuInS2, the ion intensities of In2S+ and S2+ change and assume steady-state values after some time. A second-law evaluation of intensity versus temperature data, obtained under steady-state conditions, yielded a value for the heat of the above decomposition reaction (2 moles of CuInS2) of δH298° 630.9 ± 26 kJ. With this quantity and auxiliary thermochemical data, the enthalpy of formation of CuInS2(s) was computed to be δH298.s° = -221.7 ± 13 kJ/mol.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 1983-02-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 4
    Publication Date: 2011-08-17
    Description: The positive effects of microgravity on crystal quality and fundamental properties of the vapor transport reaction were established by analyzing the results of three transport experiments on multi-component systems performed during the Apollo Soyuz Test Project (ASTP) mission. The systems employed were GeSe(0.99)Te(0.01) - GeI4 (A), GeS(0.98)Se(0.02) - GeCl4 (B), and GeS - GeCl4-Ar (C). The crystallographic analysis is based on a direct comparison of space and ground-based (prototype) crystals, employing X-ray diffraction, microprobe, microscopic, and chemical etching techniques. The results demonstrate a considerable improvement of the space-grown crystals in terms of chemical and crystalline homogeneity, surface morphology, and bulk perfection relative to ground specimens. The confirmation of greater mass transport rates than predicted for micro-gravity by present vapor transport models is of basic scientific and practical importance for the improvement of transport models and techniques on earth and for the development of a transport model for space conditions. The internal consistency and agreement between ASTP and Skylab results obtained for different compounds, transport agents, and temperature gradients strongly support the validity of these observations. The combined findings of improved crystal quality and high mass transport rates are of technological significance for space-processing applications.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: ESA Mater. Sci. in Space; p 189-206
    Format: text
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