uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Crystal chemistry and thermodynamic properties of anisotropic Ce2Ni7H4.7 hydride
Show others and affiliations
2007 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 180, no 9, 2566-2576 p.Article in journal (Refereed) Published
Abstract [en]

A new intermetallic deuteride Ce2Ni7D4.7 with an anomalous volume expansion has been studied. Its structure was solved on the basis of in situ neutron diffraction data. Expansion proceeds along the c-axis and within the CeNi2 slabs only. All D atoms are located inside these slabs and on the border between CeNi2 and CeNi5. Ordering of D atoms in the bulk of CeNi2 is accompanied by substantial deformation of these slabs thus lowering the hexagonal symmetry to orthorhombic [space group Pmcn (No. 62); a = 4.9251(3) angstrom b = 8.4933(4) angstrom, c = 29.773(1) angstrom]. Inside the CeNi2 layer the hydrogen sublattice is completely ordered; all D-D distances exceed 2.0 angstrom Local coordination of Ni by D inside the CeNi, blocks is of "open", saddle-like type. Hydrogen ordering is mainly determined by Ce-H and H-H interactions. The press ure-composition-temperature measurements yielded the following thermodynamic parameters of the formation of the hydride: Delta H = -22.4 kJ/MOl(H), Delta S = -59.9 J/(K mol(H)).

Place, publisher, year, edition, pages
2007. Vol. 180, no 9, 2566-2576 p.
Keyword [en]
metal hydrides, crystal structure and symmetry, neutron diffraction, pressure-composition-temperature relationships
National Category
Natural Sciences Engineering and Technology
URN: urn:nbn:se:uu:diva-143405DOI: 10.1016/j.jssc.2007.07.002ISI: 000249591300021OAI: oai:DiVA.org:uu-143405DiVA: diva2:390045
Available from: 2011-01-20 Created: 2011-01-20 Last updated: 2011-01-20Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
The Studsvik Neutron Research Laboratory
In the same journal
Journal of Solid State Chemistry
Natural SciencesEngineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 120 hits
ReferencesLink to record
Permanent link

Direct link