Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 41, Pages 16459-16462Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1214754109
Keywords
phase transition; structure distortion
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Funding
- EFree, an Energy Frontier Research Center
- U.S. Department of Energy (DOE), Office of Science, and Office of Basic Energy Sciences [DE-sc0001057]
- Carnegie Institution of Washington (CIW)
- Carnegie DOE Alliance Center (CDAC)
- University of Nevada, Las Vegas (UNLV)
- Lawrence Livermore National Laboratory (LLNL)
- DOE-National Nuclear Security Administration (NNSA)
- DOE-Office of Basic Energy Sciences (BES)
- National Science Foundation (NSF)
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Using synchrotron high-pressure X-ray diffraction at cryogenic temperatures, we have established the phase diagram for calcium up to 110 GPa and 5-300 K. We discovered the long-sought for theoretically predicted beta-tin structured calcium with I4(1)/amd symmetry at 35 GPa in a s mall low-temperature range below 10 K, thus resolving the enigma of absence of this lowest enthalpy phase. The stability and relations among various distorted simple-cubic phases in the Ca-III region have also been examined and clarified over a wide range of high pressures and low temperatures.
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