2 0 2019 del nov 0 journal Original Delsante, S. Novakovic, R. Gagliolo, A. Borzone, G. J. Chem. Thermodyn. 2019 2020-09-29 Thermodynamic investigation on the Mg-Pd intermetallic phases New thermodynamic information on Mg Pd alloys has been obtained in the Mg-rich part by using a hightemperature direct drop calorimeter and a high sensitive Differential Scanning Calorimeter (DSC). The calorimetric results have been validated by X-ray Powder Diffraction and Scanning Electron Microscopy coupled with Electron Probe Microanalysis analyses. The following values (kJ*mol-atom 1) of the enthalpy of formation at 27 C were obtained: -(28.2 +- 1) for Mg6Pd and -(39.5 +- 2.8) for Mg5Pd2 intermetallic phases. DSC has been employed to determine the transformation temperatures in the Mg-rich region: the congruent melting behaviour of the Mg6Pd and Mg5Pd2 phases was confirmed at a temperature of (568 +- 1) C and (691 +- 1) C, respectively and for the Lcents(Mg) + Mg6Pd eutectic reaction, a temperature of (530 +- 1) C was measured. In addition, a melting enthalpy of DfusH = (7.4 +- 0.1) kJ*mol-atom 1 and of (8.3 +- 0.1) kJ*mol-atom 1 for Mg6Pd and Mg5Pd2, respectively, was obtained. Mg-Pd alloys Thermodynamic properties Phase diagram Enthalpy of formation Differential scanning calorimetry 10.1016/j.jct.2019.105890 139 105890 1 InChI=1S/Mg FYYHWMGAXLPEAU-UHFFFAOYSA-N magnesium Mg 1 Commercial source 1 99.99 4 Stated by supplier 2 InChI=1S/Pd KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium palladium element Pd 1 Commercial source 1 99.999 5 Stated by supplier 3 InChI=1S/5Mg.2Pd RUBDZFPWQXRFQD-UHFFFAOYSA-N palladium-magnesium compound (Mg5Pd2) Mg5Pd2 1 Synthesized by the authors 1 95 2 Spectroscopy 2 Synthesized by the authors 1 99 2 Estimated by the compiler 4 InChI=1S/6Mg.Pd LECOJQLRVJXKBT-UHFFFAOYSA-N palladium-magnesium compound (Mg6Pd) Mg6Pd 1 Synthesized by the authors 1 99 2 Estimated by the compiler 1 3 2 Principal objective of the work AB TRC 1/30/2020 1 Normal melting temperature, K DTA Crystal Direct value, X 1 Data file compiler Propagation of evaluated standard uncertainties 95 Crystal Liquid Air at 1 atmosphere 1 964.15 3 1 2 2 3 2 Principal objective of the work AB TRC 1/30/2020 1 Molar enthalpy of transition or fusion, kJ/mol DSC Crystal Direct value, X 1 Data file compiler Propagation of evaluated standard uncertainties 95 Crystal Liquid Air at 1 atmosphere 1 58.1 2 1 2.1 3 4 1 Principal objective of the work AB TRC 1/30/2020 1 Normal melting temperature, K DTA Crystal Direct value, X 1 Data file compiler Propagation of evaluated standard uncertainties 95 Crystal Liquid Air at 1 atmosphere 1 841.15 3 1 2 4 4 1 Principal objective of the work AB TRC 1/30/2020 1 Molar enthalpy of transition or fusion, kJ/mol DSC Crystal Direct value, X 1 Data file compiler Propagation of evaluated standard uncertainties 95 Crystal Liquid Air at 1 atmosphere 1 51.8 2 1 2.1 5 1 1 2 1 Principal objective of the work AB TRC 1/30/2020 1 Eutectic temperature, K DTA Crystal Direct value, X 1 Data file compiler Propagation of evaluated standard uncertainties 95 Crystal 1 Crystal of intercomponent compound 1 Liquid Air at 1 atmosphere 1 803.15 2 1 0.3 1 1 -6 Crystal 2 -1 Crystal 4 1 1 Crystal Principal objective of the work AB TRC 1/30/2020 Formation of a compound from elements in their stable state 1 Molar enthalpy of reaction, kJ/mol Solution calorimetry 300.15 5 101.325 6 1 Data file compiler Propagation of evaluated standard uncertainties 95 1 -197.4 4 1 14.1 2 1 -5 Crystal 2 -2 Crystal 3 1 1 Crystal Principal objective of the work AB TRC 1/30/2020 Formation of a compound from elements in their stable state 1 Molar enthalpy of reaction, kJ/mol Solution calorimetry 300.15 5 101.325 6 1 Data file compiler Propagation of evaluated standard uncertainties 95 1 -276.5 4 1 39.2