Substitutional alloy of Ce and Al
2009 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 106, no 8, 2515-2518 p.Article in journal (Refereed) Published
The formation of substitutional alloys has been restricted to elements with similar atomic radii and electronegativity. Using high-pressure at 298 K, we synthesized a face-centered cubic disordered alloy of highly dissimilar elements (large Ce and small Al atoms) by compressing the Ce3Al intermetallic compound > 15 GPa or the Ce3Al metallic glass > 25 GPa. Synchrotron X-ray diffraction, Ce L-3-edge absorption spectroscopy, and ab initio calculations revealed that the pressure-induced Kondo volume collapse and 4f electron delocalization of Ce reduced the differences between Ce and Al and brought them within the Hume-Rothery (HR) limit for substitutional alloying. The alloy remained after complete release of pressure, which was also accompanied by the transformation of Ce back to its ambient 4f electron localized state and reversal of the Kondo volume collapse, resulting in a non-HR alloy at ambient conditions.
Place, publisher, year, edition, pages
2009. Vol. 106, no 8, 2515-2518 p.
4f electron delocalization, Ce-Al solid solution alloy, high pressure, Hume-Rothery rules, metallic glass, high-pressure, metallic glasses, crystal-structure, room-temperature, alpha transition, cerium metal, behavior, approximation, potassium, chemistry
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-18204DOI: 10.1073/pnas.0813328106ISI: 000263652900011ScopusID: 2-s2.0-62449280994OAI: oai:DiVA.org:kth-18204DiVA: diva2:336250
QC 201005252010-08-052010-08-052011-01-27Bibliographically approved