Phase barograms–phase diagrams of vapor pressure: Eutectoid phase formation in binary systems

Autor:	Tanja Scholz, Huong Dao Quoc, Peer Schmidt
Rok vydání:	2012
Předmět:	Vapor pressure Chemistry Phase (matter) Differential thermal analysis Thermal Thermodynamics Calorimetry Physical and Theoretical Chemistry Condensed Matter Physics Thermal analysis Instrumentation Eutectic system Phase diagram
Zdroj:	Thermochimica Acta. 541:1-7
ISSN:	0040-6031
DOI:	10.1016/j.tca.2012.04.022
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::baf9b4b997ab2925aaebc27073655e4d https://doi.org/10.1016/j.tca.2012.04.022 Zobrazit plný text záznamu Full Text from ScienceDirect