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

Proc Natl Acad Sci U S A

State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.

Published: October 2012

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 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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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3478652PMC
http://dx.doi.org/10.1073/pnas.1214754109DOI Listing

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