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Solid solution − xcax system in cu5gd1: structure, stability and hydrogenation

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Document pages: 9 pages

Abstract: We report the synthesis and characterization of a group of novel compounds based on copper, gadolinium and calcium. Cu Ca and Cu GD binaries have been studied before, and Ca and Gd are immiscible. The phase stability and crystal structure of the new compounds were studied in five samples (0, 0.33, 0.50, 0.66 and 1, respectively). The effect of replacing Gd with Ca in CU5 compound () was studied. The samples prepared by melt spinning have hexagonal P6 MMM structure, which is independent of Ca content (), and the lattice parameters change linearly. This shows that it has good solid solubility under the preparation conditions. The cooling rate slows down during arc melting, resulting in liquid phase separation into cu4.5gd and Cu CA compounds. Using TEM, fastsolidified ribbons (Cu5Gd0.5Ca0.5) were investigated and the formation of a homogeneous ternary phase with a nearly nominal stoichiometric composition and minor amounts of Cu-Ca secondary phase was observed. Using DSC and HT XRD, we found that these systems are stable at least up to 400°C. Upon a 16-hour hydrogenation at 1 bar and 300°C, all specimens absorbed about 0.5 wt. of hydrogen. This caused changes in structure with the formation of pure Cu and H2 solid solution.

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