title: Calcium with the β-tin structure at high pressure and low temperature.
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.
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Ding
authors.forename: Wenge
authors.initials: W
authors.lastname: Yang
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.forename: Bo
authors.initials: B
authors.lastname: Zou
authors.forename: Jinfu
authors.initials: J
authors.lastname: Shu
authors.forename: Stas
authors.initials: S
authors.lastname: Sinogeikin
authors.forename: Changyong
authors.initials: C
authors.lastname: Park
authors.forename: Guangtian
authors.initials: G
authors.lastname: Zou
authors.forename: Ho-kwang
authors.initials: HK
authors.lastname: Mao
mesh_terms: D002118:Calcium / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D044367:Phase Transition; D011312:Pressure; D013696:Temperature; D014001:Tin / Q000737:chemistry*; D014961:X-Ray Diffraction / Q000379:methods
chemical_list: D014001:Tin; D002118:Calcium