期刊
PHYSICAL REVIEW B
卷 81, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.140106
关键词
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资金
- MEXT, Japan [19104009]
- Grants-in-Aid for Scientific Research [19104009] Funding Source: KAKEN
Compressed calcium exhibits successive structural transitions: face-centered cubic (Ca-I)-> body-centered cubic (Ca-II)-> simple cubic (Ca-III)-> P4(1)2(1)2 (Ca-IV)-> Cmca(Ca-V). We performed x-ray diffraction measurements of calcium at pressure up to 172 GPa at room temperature and noted a high-pressure phase Ca-VI above 158 GPa. The structure was determined to be an orthorhombic Pnma by a Rietveld analysis and confirmed the structure with a density-functional theory calculation. The obtained structure matched to the ones predicted by Yao et al. [Phys. Rev. B 78, 054506 (2008)] well. An orthorhombic model for Ca-III is briefly reported.
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