Calcium with the β-tin structure at high pressure and low temperature

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 β-tin structured calcium with I 4 ₁/amd symmetry at 35 GPa in a s mall low-temperature r...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2012-10, Vol.109 (41), p.16459-16462
Main Authors: Li, Bing, Ding, Yang, Yang, Wenge, Wang, Lin, Zou, Bo, Shu, Jinfu, Sinogeikin, Stas, Park, Changyong, Zou, Guangtian, Mao, Ho-kwang
Format: Article
Language:English
Subjects:
Calcium
Calcium - chemistry
Cooling
Cubic crystals
Electrical phases
Enthalpy
Fees
High pressure
Low temperature
Models, Chemical
Models, Molecular
Phase diagrams
Phase Transition
physical phases
Physical Sciences
Pressure
Room temperature
Temperature
Tin - chemistry
X-ray diffraction
X-Ray Diffraction - methods
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Summary: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 β-tin structured calcium with I 4 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.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1214754109