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Mg-Ni-Ga System: Phase Diagram, Structural and Hydrogenation Properties of MgNi1.25Ga0.75, MgNiGa, and Mg2NiGa3

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Abstract

The isothermal section at 473 K of the Mg-Ni-Ga system in the entire composition regime and structural characterizations of the observed ternary phases are reported. The MgNi1+xGa1-x (x = 0.25), MgNiGa, Mg2NiGa3, Mg9-xNi6Ga14-y (x = 0.32, y = 0.84), Mg3Ni2Ga, and MgNi2Ga5 structures were solved and refined from X-ray single crystal diffraction data. MgNi1+xGa1-x (x = 0.25, Fd-3 m, a = 7.0781(2) Å) and MgNiGa (P63/mmc, a = 5.0781(3) Å, c = 8.194(1) Å) crystallize in the Laves phase MgCu2 and MgZn2 structure types, respectively. Mg2NiGa3 (Cmcm, a = 5.415(1) Å, b = 8.651(1) Å, c = 8.562(2) Å, Mg2MnGa3-type) represents the orthorhombic derivative of Laves phases. Mg9-xNi6Ga14-y (x = 0.32, y = 0.84, Fd-3 m, a = 19.8621(6) Å) is isostructural with Mg35Cu24Ga53. MgNi2Ga5 (Pnnm, a = 6.2704(1) Å b = 6.6902(1) Å c = 6.0794(1) Å) crystallizes in the MgCo2Ga5-type structure which is derived from tetragonal CoGa3-type. The crystal chemistry of these structures is compared and discussed. The hydrogenation properties of the MgNi1+xGa1-x (x = 0.25), MgNiGa, and Mg2NiGa3 Laves phases were studied. MgNi1.25Ga0.75 absorbs up to 2.20 wt.% H2, MgNiGa absorbs up to 1.78 wt.% H2, and Mg2NiGa3 absorbs up to 1.66 wt.% H2.

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Acknowledgements

Financial support from the National Science Centre, Poland (No 2017/25/B/ST8/02179) and German Academic Exchange Service (DAAD) is gratefully acknowledged (No 91774331, bilateral PhD scholarship grant).

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Ivan Franko Lviv National University, Lviv, Ukraine

    Nazar Pavlyuk, Grygoriy Dmytriv & Volodymyr Pavlyuk

  2. Institute of Chemistry, Częstochowa Jan Długosz University, Częstochowa, Poland

    Nazar Pavlyuk & Volodymyr Pavlyuk

  3. Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany

    Ihor Chumak, Sylvio Indris & Helmut Ehrenberg

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  1. Nazar Pavlyuk
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Pavlyuk, N., Dmytriv, G., Pavlyuk, V. et al. Mg-Ni-Ga System: Phase Diagram, Structural and Hydrogenation Properties of MgNi1.25Ga0.75, MgNiGa, and Mg2NiGa3. J. Phase Equilib. Diffus. 43, 458–470 (2022). https://doi.org/10.1007/s11669-022-00985-2

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