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  • 1
    ISSN: 0044-2313
    Keywords: Chemical transport ; In2(SO4)3 ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions on the Thermal Behaviour of Sulfates XII. The Chemical Vapour Transport of In2(SO4)3 with Cl2 and HCl. Experimental Results and CalculationsBy means of CVT (T1 between 500°C and 825°C; ΔT = 50°C), well shaped crystals of anhydrous In2(SO4)3 can be grown in the less hot region of a closed silica ampoule. We investigated the dependence of the deposition rate on the variation of the concentration of the transport agent (system In2(SO4)3/Cl2) and on the variation of the transport temperature (In2(SO4)3/Cl2 as well as In2(SO4)3/HCl).A comparison of the experimental results with thermodynamical calculations shows a satisfying agreement. The influence of the variation of some additional parameters (H2O from the wall of the ampoule; ΔBH2980(In2(SO4)3)) on the deposition rate is discussed.
    Notes: Chemische Transportexperimente im Temperaturgradienten (500°C ≤ T1 ≤ 825°C; T2 〉 T1; ΔT = 50°C) ermöglichten es, gut ausgebildete Kristalle von wasserfreiem In2(SO4)3 in der weniger heißen Zone einer geschlossenen Quarzampulle phasenrein abzuscheiden. Der Einfluß einer Variation der Transportmittelkonzentration (C(Cl2)) (Cl2 eingesetzt als PtCl2)) sowie der mittleren Transporttemperatur (T̄ = 0,5 · (T2 + T1)) auf die Transportrate wurde untersucht. Weiterhin wurden Experimente mit dem Transportmittel HCl bei unterschiedlichem T̄ durchgeführt.Die Beobachtungen lassen sich durch thermodynamische Modellrechnungen befriedigend wiedergeben. Der Einfluß einer Variation weiterer Parameter (H2O aus der Ampullenwand; ΔBH2980(In2(SO4)3) auf die berechneten Transportraten wird diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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