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      Calorimetric Studies of Magnesium-Rich Mg-Pd Alloys

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          Abstract

          Solution calorimetry with liquid aluminum as the bath was conducted to measure the enthalpy of a solution of magnesium and palladium as well as the standard formation enthalpies of selected magnesium-palladium alloys. These alloys were synthesized from pure elements, which were melted in a resistance furnace that was placed in a glove box containing high-purity argon and a very low concentration of impurities, such as oxygen and water vapor. A Setaram MHTC 96 Line evo drop calorimeter was used to determine the energetic effects of the solution. The enthalpies of the Mg and Pd solutions in liquid aluminum were measured at 1033 K, and they equaled −8.6 ± 1.1 and −186.8 ± 1.1 kJ/mol, respectively. The values of the standard formation enthalpy of the investigated alloys with concentrations close to the Mg 6Pd, ε, Mg 5Pd 2, and Mg 2Pd intermetallic phases were determined as follows: −28.0 ± 1.2 kJ/mol of atoms, −32.6 ± 1.6 kJ/mol of atoms, −46.8 ± 1.4 kJ/mol of atoms, and −56.0 ± 1.6 kJ/mol of atoms, respectively. The latter data were compared with existing experimental and theoretical data from the literature along with data calculated using the Miedema model.

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          Most cited references 47

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          SGTE data for pure elements

           A.T. Dinsdale (1991)
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            Reaction of hydrogen with alloys of magnesium and nickel and the formation of Mg2NiH4

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              Hydrogen-storage materials for mobile applications.

              Mobility--the transport of people and goods - is a socioeconomic reality that will surely increase in the coming years. It should be safe, economic and reasonably clean. Little energy needs to be expended to overcome potential energy changes, but a great deal is lost through friction (for cars about 10 kWh per 100 km) and low-efficiency energy conversion. Vehicles can be run either by connecting them to a continuous supply of energy or by storing energy on board. Hydrogen would be ideal as a synthetic fuel because it is lightweight, highly abundant and its oxidation product (water) is environmentally benign, but storage remains a problem. Here we present recent developments in the search for innovative materials with high hydrogen-storage capacity.
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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                02 February 2021
                February 2021
                : 14
                : 3
                Affiliations
                [1 ]Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Cracow, Poland; a.debski@ 123456imim.pl (A.D.); s.terlicka@ 123456imim.pl (S.T.); w.gasior@ 123456imim.pl (W.G.)
                [2 ]Department of Materials Science and Engineering, National Dong Hwa University, Shoufong 974, Taiwan; wojtek@ 123456gms.ndhu.edu.tw
                [3 ]Department of Functional Materials and Hydrogen Technology, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland; magda.peska@ 123456wat.edu.pl (M.P.); julita.dworecka@ 123456wat.edu.pl (J.D.-W.)
                Author notes
                Article
                materials-14-00680
                10.3390/ma14030680
                7867242
                33540597
                © 2021 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                Categories
                Technical Note

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