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The use of the High-Temperature Gas-Balance (HTGB) for thermogravimetric measurements |
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| Authors: | Peer Schmidt Michael Sch?neich Melanie Bawohl Tom Nilges Richard Weihrich |
| Institution: | 1. Faculty of Sciences, Inorganic Solids and Materials, Lausitz University of Applied Science, P.O. Box 101548, 01958, Senftenberg, Germany 2. Department of Inorganic Chemistry, Technische Universit?t Dresden, Helmholtzstrasse 10, 01069, Dresden, Germany 3. Institute for Inorganic and Analytical Chemistry, WWU M??nster, Corrensstra?e 30, 48149, M??nster, Germany 4. Department of Chemistry, Technische Universit?t M??nchen, Lichtenbergstr. 4, 85737, Garching, Germany 5. Institute for Inorganic Chemistry, Universit?t Regensburg, Universit?tsstr. 31, 93040, Regensburg, Germany |
| Abstract: | Several methods are established in thermal analysis to investigate phase formation, phase transition, and decomposition reactions. The analysis of phase equilibria with volatile components is particularly feasible by using standard method of thermogravimetry. Hardly any investigations of phase formation reactions are possible to realize if one of the components is lost by vaporization. By using the ??High-Temperature Gas-Balance?? (HTGB), the vapor phase is enclosed in a silica ampoule and thus forms an equilibrium gas phase in permanent contact with the solid phase. The measurement signal ??m meas is caused by change of the leverage of the horizontal balance support during evaporation and condensation. The application of the HTGB allows the analysis of solid?Cgas equilibria in the working range from 0.01 till 15?bar at temperatures up to 1,100?°C. The first comparison of evaporation reactions determined by standard thermogravimetric analyses and by measurements using the HTGB is given for the inorganic systems: P, As, SeO2, PtI2, and Hg/I. |
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