Phase barograms – phased diagrams of vapour pressure: Eutectoid Phase Formation in Binary Systems

  • Phase barograms are specific representations of conventional (x, T) phase diagrams considering the vapor pressure as additional thermodynamic parameter. Thus, the determination of the vapor pressure is complementary to conventional DTA or DSC measurements. A stringent relationship between the phase diagram and the corresponding phase barogram is derived by thermodynamic considerations of phase relations for complex heterogeneous equilibria. For that purpose, a derivative of the three-dimensional Clausius–Clapeyron equation is utilized. As a result, a validation of DTA/DSC measurements becomes feasible by the transformation of characteristic effects of vapor pressure measurements into thermal effects in conventional phase diagrams. The system CsBr/SeO2 is presented as a case study of systems with a eutectoid phase formation. CsSeO2Br is formed from the binaries at ϑf = 180(5) °C; the compound decomposes peritectically at ϑp = 470(10) °C.

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Author: Tanja Scholz, Huong Dao Quoc, Peer SchmidtORCiD
URL:http://www.sciencedirect.com/science/article/pii/S0040603112001979
DOI:https://doi.org/10.1016/j.tca.2012.04.022
Title of the source (English):Thermochimica Acta
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2012
Tag:CsBr; Phase barogram; Phase diagram; SeO2; Vapor pressure
Volume/Year:541
First Page:1
Last Page:7
Faculty/Chair:Fakultät 2 Umwelt und Naturwissenschaften / FG Anorganische Chemie
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