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Synthesis and crystal structure of κ-Zr9V4SH~23

Zavaliy, I. Yu.
Koval’chuck, I. V.
Riabov, A. B.
Denys, R. V.
Published in Journal of Alloys and Compounds. 2005, vol. 404-406, p. 118-121
Abstract The Zr9V4SH∼23 hydride was synthesized by saturation from gaseous hydrogen at room temperature and 0.12 MPa hydrogen pressure. The measured hydrogen absorption capacity of the κ-Zr9V4S was 1.77 H/M. The refinement of the hydride structure with the use of X-ray powder diffraction data confirmed the preserved symmetry of the metallic matrix (sp.gr. P63 /mmc, a=9.2715(2), c=9.0756(4)Å, Δa/a=7.3%, Δc/c=6.1%, ΔV/V=22.1%, ΔV/at.H=2.62 Å3). The analysis of interstices in this compound revealed that without positioning hydrogen atoms in triangular Zr3 interstices it is impossible to model the structure of k-hydride with the experimentally observed capacity. Neutron powder diffraction study of the Zr9V4SD∼23 deuteride (sp.gr. P63/mmc, a=9.2779(5), c=9.0779(5) Å) revealed deuterium atoms filling two tetrahedral and three triangular interstices. A full occupancy of only one site (D4) was observed in our sample giving the refined deuterium content of 20.8(2) D/f.u. Filling of the D4 site causes a displacement of the sulphur atoms from the three-fold axis (splitting of 2c to 6h position)
Keywords Hydrogen storage materialsIntermetallicsCrystal structure and symmetryX-ray diffractionNeutron diffraction
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ZAVALIY, I. Yu. et al. Synthesis and crystal structure of κ-Zr9V4SH~23. In: Journal of Alloys and Compounds, 2005, vol. 404-406, p. 118-121. doi: 10.1016/j.jallcom.2004.12.168 https://archive-ouverte.unige.ch/unige:35491

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Deposited on : 2014-04-08

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