NDLI: Structural and In Situ X-ray Diffraction Study of Hydrogenation of $Ca_{x}Mg_{1−x}Ni_{2}$ (0 ≤ x ≤ 1)

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Structural and In Situ X-ray Diffraction Study of Hydrogenation of $Ca_{x}Mg_{1−x}Ni_{2}$ (0 ≤ x ≤ 1)

Content Provider	MDPI
Author	Rehman, Zia Ur Nawaz, Mohsan Ullah, Hameed Ahmad, Pervaiz Khandaker, Mayeen Uddin Idris, Abubakr M. Haq, Sirajul Sulieman, Abdelmoneim
Copyright Year	2021
Description	In the quasi-binary system $CaNi_{2}-MgNi_{2}$ solid-solutions $Ca_{x}Mg_{1−x}Ni_{2}$ (0 ≤ x ≤ 1) were prepared from the elements. They crystallize in the hexagonal Laves phase type $(MgNi_{2}$, C36) for x ≤ 0.33 $(P6_{3}$/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 $(MgCu_{2}$, C15) for 0.33 < x (Fd $3¯$ m, a = 697.12(3) pm for x = 0.5, a = 705.11(2) pm for x = 0.67, a = 724.80(2) pm for x = 1). After hydrogenation in an autoclave the X-ray diffraction patterns changed completely. Reflections assigned to $CaNiH_{3,}$ and Ni and Rietveld refinement confirmed this. The hydrogenation properties of $Ca_{x}Mg_{1−x}Ni_{2}$ (0 ≤ x ≤ 1) compounds were also studied in situ by X-ray powder diffraction. In situ X-ray powder diffraction of $Ca_{x}Mg_{1−x}Ni_{2}$ (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 $Ca_{x}Mg_{1−x}Ni_{2}$ (0 ≤ x ≤ 1) compounds were crystalline.
Starting Page	47
e-ISSN	20734352
DOI	10.3390/cryst12010047
Journal	Crystals
Issue Number	1
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2021-12-30
Access Restriction	Open
Subject Keyword	Crystals Characterization and Testing of Materials Hydrogen Storage Metal Hydrides X-ray Diffraction in Situ Techniques Microscopy
Content Type	Text
Resource Type	Article

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