High pressure Raman and X-ray studies of sulfur and its new phase transition

作者：Lizhong Wang, Yongnian Zhao, Lu Ren, Yue Meng, Yuguo Fan, Huan Luo, Qiliang Cui, Guangtian Zou · 发表于：Geophysical monograph · 年份：1987 · DOI：10.1029/gm039p0299 · 被引用次数：7 · 研究领域：Solid-state spectroscopy and crystallography、High-pressure geophysics and materials、Crystal Structures and Properties

High pressure Raman spectra reveal that orthorhombic sulfur probably undergoes a structural transition at ambient temperature and about 5 GPa. In situ single-crystal X-ray diffraction data confirm that the orthorhombic structure transforms into a triclinic structure at 5.3 GPa. The dependence of mode-Grüneisen parameter (γ l ) on vibrational frequency (ν l ) was determined at several pressures from the Raman spectra and compressibilities measured with a pistoncylinder apparatus. The behavior of γ l with ν l is roughly described by the expression γ l ∼ν l −2.