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Reversible structural change and thermodynamic properties of hydrogen in thin vanadium films
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 16, 165418- p.Article in journal (Refereed) Published
Abstract [en]

The absorption of H in 50nm V(001) films under pressures of 1–104Pa H2 and at temperatures between 310 and 530K was studied using in situ combined x-ray diffraction (XRD) and electrical resistivity measurements. The H-induced XRD peak shifts clearly indicate a fully reversible and nondeteriorating first-order phase transformation for the film. The H-induced residual resistivity changes in the V film demonstrate several extreme points (maxima and minima) apparently associated with some special points on the pressure isotherms of the film both below and above the critical temperature (Tc=460±20K) . Correlating these extreme points with the known V(bulk)-H phase diagram indicates that, in addition to the first-order transformation, two additional reversible second-order transitions exist in the film. The enthalpy and entropy of this transformation, obtained from the temperature dependence of the plateau pressures, are ‑39±1kJ/mol°K , and ‑60±2J/mol , respectively. The thermodynamic constants and the lattice parameters of the phases for the first-order transformation in the film closely correspond to the α→β phase transformation in bulk V.

Place, publisher, year, edition, pages
2007. Vol. 75, no 16, 165418- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-11182DOI: 10.1103/PhysRevB.75.165418ISI: 000246075900079OAI: oai:DiVA.org:uu-11182DiVA: diva2:38950
Available from: 2007-06-08 Created: 2007-06-08 Last updated: 2017-12-11Bibliographically approved

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Hjörvarsson, Björgvin

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