Calcium with the β-tin structure at high pressure and low temperature
- 25 September 2012
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 109 (41), 16459-16462
- https://doi.org/10.1073/pnas.1214754109
Abstract
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.Keywords
This publication has 29 references indexed in Scilit:
- Large amplitude fluxional behaviour of elemental calcium under high pressureScientific Reports, 2012
- Distortions and stabilization of simple-cubic calcium at high pressure and low temperatureProceedings of the National Academy of Sciences of the United States of America, 2010
- Exotic behavior and crystal structures of calcium under pressureProceedings of the National Academy of Sciences of the United States of America, 2010
- Competing phases, strong electron-phonon interaction, and superconductivity in elemental calcium under high pressurePhysical Review B, 2009
- Fermi surface nesting and phonon instabilities in simple cubic calciumHigh Pressure Research, 2008
- New diamond cell for single-crystal x-ray diffractionReview of Scientific Instruments, 2006
- Observation of the incommensurate barium-IV structure in strontium phase VPhysical Review B, 2000
- Theoretical Confirmation of the High Pressure Simple Cubic Phase in CalciumPhysical Review Letters, 1995
- Single crystal x-ray diffraction with a synchrotron source in a mdac at low temperatureHigh Pressure Research, 1992
- Electrical-resistance behavior of Ca at high pressures and low temperaturesPhysical Review B, 1981