TY - JOUR
T1 - Order-disorder transition in monoclinic sulfur
T2 - A precise structural study by high-resolution neutron powder diffraction
AU - David, W. I.F.
AU - Ibberson, R. M.
AU - Cox, S. F.J.
AU - Wood, P. T.
PY - 2006/12
Y1 - 2006/12
N2 - 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, β= 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.
AB - 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, β= 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.
UR - http://www.scopus.com/inward/record.url?scp=33845308620&partnerID=8YFLogxK
U2 - 10.1107/S0108768106039309
DO - 10.1107/S0108768106039309
M3 - Article
C2 - 17108646
AN - SCOPUS:33845308620
SN - 0108-7681
VL - 62
SP - 953
EP - 959
JO - Acta Crystallographica Section B: Structural Science
JF - Acta Crystallographica Section B: Structural Science
IS - 6
ER -