Thermal analysis detecting equilibrium conditions: The use of the high temperature gas balance for thermogravimetric measurements

  • 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 Δmmeas 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–gas 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, andSeveral 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 Δmmeas 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–gas 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.show moreshow less

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Metadaten
Author: Peer SchmidtORCiD, Michael Schöneich, Melanie Bawohl, Tom Nilges, Richard Weihrich
URL:http://www.akademiai.com/doi/pdf/10.1007/s10973-011-2107-3
DOI:https://doi.org/10.1007/s10973-011-2107-3
ISSN:1572-8943
Title of the source (English):Journal of Thermal Analysis and Calorimetry
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2012
Tag:Equilibrium measurements; High-Temperature Gas-Balance; Thermogravimetry; Vapor pressure
Volume/Year:110
Issue number:3
First Page:1511
Last Page:1521
Faculty/Chair:Fakultät 2 Umwelt und Naturwissenschaften / FG Anorganische Chemie
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