Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1811296 | Physica B: Condensed Matter | 2011 | 4 Pages |
Abstract
High pressure behavior of CaB6 with cubic crystal structure is investigated by means of energy dispersive X-ray diffraction and by employing in situ resistance measurement in a diamond anvil cell. Two newcome high pressure phase transitions are found with pressure ranging from ambient to 26Â GPa. The first one at 12Â GPa is a structural phase transition from CsCl-type structure to orthogonal structure, which is reflected by both the X-ray diffraction and the resistance variation. The other one at 3.7Â GPa is suggested to be an electronic transition, which is observed only in resistance measurement. The diffraction pattern recovered while the pressure is released to 0Â GPa with a pressure hysteresis over 11Â GPa, which implies the reversibility of the two phase transitions. Bulk moduli of the cubic and orthogonal phases are estimated by fitting the data to a Brich-Murnaghan equation of state equal to 169.9 and 48.2Â GPa, respectively.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Ming Li, Wuming Yang, Lixin Li, Huixin Wang, Shaowei Liang, Chunxiao Gao,