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- W2019931515 abstract "Novel hydrides were synthesized in Mg–Ni–H and Mg–Ni–Cu–H systems by high-pressure technique using a cubic-anvil-type apparatus. Crystal structure and thermal stability of the hydrides were studied. The novel hydride with a composition of MgNi2Hy was synthesized at 973 K for 2 h under the pressure of over 2 GPa. This hydride could be synthesized from each starting material, such as MgNi2(C36) and mixture of MgH2–x mol% Ni (x = 65–70). From fusion analysis, hydrogen content of the sample of MgH2–67 at.% Ni prepared with hydrogen source at 973 K for 2 h under 5 GPa was estimated to be 2.23 mass% and chemical formula was corresponding to be MgNi2H3.2. The novel hydride was found to exhibit the body-centered tetragonal structure (space group I4/mmm, No. 139) with lattice parameters of a = 0.327(3) nm, c = 0.878(9) nm. Moreover, crystal structure of novel hydride was distorted with varying Ni content, then it was found to exhibit C-faced based-centered orthorhombic structure (space group Pmmm, No. 47) with lattice parameters of a = 0.460(1) nm, b = 0.468(1) nm, c = 0.893(1) nm. In Mg–Ni–Cu–H system, crystal structure and thermal stability of Mg(Ni1−xCux)2Hy (x = 0.05, 0.10, 0.15, 0.20) were investigated. The sample of Mg(Ni0.95Cu0.05)2 prepared with hydrogen source at 973 K for 8 h under 5 GPa was dehydrogenated at 446 K, which is 15 K lower than that of MgNi2H3.2. Moreover, Mg(Ni0.95Cu0.05)2 prepared with hydrogen source at 973 K for 2 h under 5 GPa,which did not react hydrogen sufficiently, was decomposed at 409 K." @default.
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- W2019931515 date "2007-10-01" @default.
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- W2019931515 title "High-pressure synthesis of novel hydride in Mg–Ni–H and Mg–Ni–Cu–H systems" @default.
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- W2019931515 doi "https://doi.org/10.1016/j.jallcom.2007.04.221" @default.
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