Order-disorder transition in monoclinic sulfur: a precise structural study by high-resolution neutron powder diffraction.
Acta Crystallogr B
; 62(Pt 6): 953-9, 2006 Dec.
Article
in En
| MEDLINE
| ID: mdl-17108646
ABSTRACT
High-resolution neutron powder diffraction has been used in order to characterize the order-disorder transition in monoclinic cyclo-octasulphur. Rapid data collection and the novel use of geometrically constrained refinements has enabled a direct and precise determination of the order parameter, based on molecular site occupancies, to be made. The transition is critical and continuous; with a transition temperature, Tc=198.4 (3) K, and a critical exponent, beta=0.28 (3), which is indicative of three-dimensional ordering. Difficulties encountered as a consequence of the low thermal conductivity of the sample are discussed.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Sulfur
Type of study:
Diagnostic_studies
Language:
En
Journal:
Acta Crystallogr B
Year:
2006
Document type:
Article
Affiliation country:
United kingdom