RT info:eu-repo/semantics/article
T1 Vibrational dynamics and stability of the high-pressure chain and ring phases in S and Se
A1 Degtyareva, Olga
A1 Hernández, Eduardo R.
A1 Somayazulu, Maddury
A1 Mao, Ho-kwang
A1 Gregoryanz, Eugene
A1 Hemley, Russell J.
A1 Serrano Gutiérrez, Jorge
AB The high-pressure phases of group-VI elements sulfur and selenium in their spiral chain and ring structures are examined by in situ Raman and x-ray diffraction techniques combined with first principles electronic structure calculations. The S-II, S-III, Se-I, and Se-VII having spiral chain structures and S-VI with a molecular six-member ring structure are studied in a wide range. The square spiral chain structure of S-III and Se-VII is characterized by seven Raman modes that harden with increasing pressure. The calculations reproduce the observed frequencies and allow the authors to make the mode assignment. The “p-S” and “hplt” phases of sulfur reported by previous Raman studies are identified as S-II and S-III with the triangular and square spiral chain structures, respectively. The phase relations obtained by the x-ray and Raman measurements show that the high-pressure high-temperature phases of sulfur, observed by x-ray, can be induced by laser illumination at room temperature.
PB American Institute of Physics
SN 0021-9606
YR 2007
FD 2007
LK https://uvadoc.uva.es/handle/10324/65318
UL https://uvadoc.uva.es/handle/10324/65318
LA eng
NO J. Chem. Phys. 126, 084503 (2007)
DS UVaDOC
RD 11-jul-2024