Structural and In Situ X-ray Diffraction Study of Hydrogenation of Ca x Mg 1− x Ni 2 (0 ≤ x ≤ 1).

Rehman, Zia Ur; Nawaz, Mohsan; Ullah, Hameed; Ahmad, Pervaiz; Khandaker, Mayeen Uddin; Idris, Abubakr M.; Haq, Sirajul; Sulieman, Abdelmoneim

In the quasi-binary system CaNi2-MgNi2 solid-solutions CaxMg1−xNi2 (0 ≤ x ≤ 1) were prepared from the elements. They crystallize in the hexagonal Laves phase type (MgNi2, C36) for x ≤ 0.33 (P63/mmc, a = 482.51(7) pm, c = 1582.1(3) pm for x = 0, a = 482.59(3), c = 1583.1(1) for x = 0.33) and in the cubic Laves phase type (MgCu2, C15) for 0.33 3, and Ni and Rietveld refinement confirmed this. The hydrogenation properties of CaxMg1−xNi2 (0 ≤ x ≤ 1) compounds were also studied in situ by X-ray powder diffraction. In situ X-ray powder diffraction of CaxMg1−xNi2 (0 ≤ x ≤ 1) compounds under 0.3 MPa hydrogen gas flow (15 sccm), data collected on a Rigaku SmartLab diffractometer in an Anton Paar XRK 900 Reactor Chamber using Cu-Kα1 radiation. Scanning electron microscopy and EDX spectroscopy confirmed the entitled materials and elemental composition, respectively. From the Transmission electron microscopy and Selected area electron diffraction concluded that the CaxMg1−xNi2 (0 ≤ x ≤ 1) compounds were crystalline.

X-ray diffraction; X-ray powder diffraction; HYDROGENATION; ENERGY dispersive X-ray spectroscopy; TRANSMISSION electron microscopy; NEUTRON diffraction; ELECTRON diffraction

Crystals (2073-4352), 2022, Vol 12, Issue 1, p47

2073-4352

Academic Journal

10.3390/cryst12010047