Calorimetric Studies of the Mg-Pt System
Adam Dębski, Magda Pęska, Sylwia Terlicka, Julita Dworecka-Wójcik, Władysław Gąsior, Wojciech Gierlotka, Andrzej Budziak, Marek Polański
TL;DR
This paper reports new calorimetric data on the Mg-Pt system, including the enthalpy of formation for various intermetallic phases.
Contribution
The study provides the first calorimetric measurements of standard enthalpies of formation for Mg-Pt intermetallic phases.
Findings
The limiting partial enthalpy of Pt in liquid Sn and Al baths was measured at different temperatures.
Standard enthalpies of formation for Mg-Pt intermetallic phases were calculated and compared with theoretical models.
Miedema’s model predictions were found to be less exothermic than experimental and other theoretical data.
Abstract
This study presents the limiting partial enthalpy of a solution of Pt in liquid Sn and Al baths, as well as, for the first time, the standard enthalpies of the formation of intermetallic phases and alloys of the Mg–Pt system, obtained using solution calorimetry. The alloys were prepared via mechanical alloying and subsequently examined via X-ray diffraction (XRD) and scanning electron microscopy (SEM). The limiting partial enthalpy of a solution of Pt in liquid baths was measured at 931 K and 1033 K in the Sn bath and at 1036 K in the Al bath. The measured values are negative and equal to −126.0 ± 3.4 kJ/mol and −126.3 ± 3.5 kJ/mol at 931 K and 1033 K, respectively, in the Sn bath and −217.9 ± 1.2 kJ/mol in the Al bath. Subsequently, the measured heat effects were used to calculate the standard enthalpies of the formation of the intermetallic phases. The resulting values are as follows:…
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Taxonomy
TopicsHydrogen Storage and Materials · Magnesium Alloys: Properties and Applications · Thermodynamic and Structural Properties of Metals and Alloys