Structure and thermal expansion of the low-temperature phase of SF 6

Автор(и)

  • A. P. Isakina B. Verkin Institute for Low Temperature Physics and Engineering, 47 Lenin Ave., 61164 Kharkov, Ukraine
  • A. I. Prokhvatilov B. Verkin Institute for Low Temperature Physics and Engineering, 47 Lenin Ave., 61164 Kharkov, Ukraine
  • J. Rodriguez-Carvajal Laboratory Leon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France

DOI:

https://doi.org/10.1063/1.593926

Ключові слова:

PACS: 61.10.√i, 61.12.√q, 61.50.Ks, 61.50.Em, 65.70. y, 65.50. m

Анотація

Powder x-ray and neutron diffraction studies of the crystalline structure, lattice parameters and thermal expansion coefficients of sulphur hexafluoride SF6 are performed in the temperature range 1.64√110 K. It is shown that the low-temperature phase (at T < 94.3 K) is monoclinic, space group C 2/m (C2h3 ) with Z=6 in which 1/3 of molecules SF6 occupy the positions of higher symmetry (2/m) and 2/3 of molecules ≈ lower one (m). As follows from the analysis of obtained structural results, an availability of two types of molecular local symmetry positions is responsible for the anisotropic character of molecular rotation, peculiarities on the temperature dependences of structural and thermo-dynamic properties of SF6 crystals at low-temperature phase, especially near Tc of orientational phase transition. It is carried out a detail comparison the present results with the known literature data.

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Опубліковано

2000-04-10

Як цитувати

(1)
Isakina, A. P.; Prokhvatilov, A. I.; Rodriguez-Carvajal, J. Structure and Thermal Expansion of the Low-Temperature Phase of SF 6. Fiz. Nizk. Temp. 2000, 26, 404-414.

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