期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 8, 页码 2515-2518出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0813328106
关键词
4f electron delocalization; Ce-Al solid solution alloy; high pressure; Hume-Rothery rules; metallic glass
资金
- Department of Energy-Basic Energy Sciences
- Department of Energy-National Nuclear Security Administration (Carnegie/Department of Energy Alliance Center)
- National Science Foundation
- Department of Defense-Tank-Automotive and Armaments Command
- W. M. Keck Foundation
- Department of Energy-Basic Energy Sciences [DE-AC02-06CH11357]
- U. S. Department of Energy-Basic Energy Sciences
- Natural Sciences and Engineering Research Council of Canada
- University of Washington
- Simon Fraser University
- Advanced Photon Source
- Balzan Foundation
- National Natural Science Foundation of China Grants [0425102, 50601021, 50701038, 60776014, 60876002, 10804096]
- Zhejiang University-Helmholtz Cooperation Fund
- Ministry of Education of China
- Department of Science and Technology of Zhejiang Province
- Zhejiang University
- Swedish Research Council
- Swedish National Infrastructure for Computing
- Uppsala Multidisciplinary Center for Advanced Computational Science
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.
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