Deuterium site occupancies in Ce2Ni7D∼4 and comparison with CeNi3D2.8
(2007) Journal of Alloys and Compounds — Vol. 446-447, p. 3-5 (2007)
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- Abstract
- The deuterium atoms in both Ce2Ni7D∼4 and CeNi3D2.8 occupy interstices in the CeNi2 structural slabs only, while the interstices in the bulk of the CeNi5 slabs remain empty. A considerable fraction of these deuterium atoms surround nickel in deformed tetrahedral configurations reminiscent of the [NiH4]4- complexes found in complex metal hydrides, like Mg2NiH4 and LaMg2NiH7. The hydrogen equilibrium pressures of both systems are similar (0.1-0.2 bar at 50 °C). These findings not only provide further evidence for directional bonding effects in hydrides that are traditionally considered as "interstitial", but also suggest that the thermal stability of metal hydrides having composite crystal structures is correlated with metal-hydrogen bond formation/breaking in specific structural units. © 2007 Elsevier B.V. All rights reserved.
- Affiliations
ESRF, Grenoble (France) Chimie
Citations
Filinchuk, Y., & Yvon, K. (2007). Deuterium site occupancies in Ce2Ni7D∼4 and comparison with CeNi3D2.8. Journal of Alloys and Compounds, 446-447, 3-5. https://doi.org/10.1016/j.jallcom.2007.03.020 (Original work published 2007)