ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
About forty X-ray powder diagrams were recorded, in the range 5 to 295 K, with a prototype diffractometer and a high-efficiency cryostat. The temperature dependence of the cell parameters and the principal thermal expansion coefficients presents anomalies (below 240 K) which are due to the existence of an order–disorder transition in the range 240–170K. There is a correlation between the temperature dependence of the thermal expansion coefficients αhkl and the asymmetric broadening of corresponding peaks. The existence of domains and frontier zones and the important reorganization of the molecular packing, in the ordered phase, explain the asymmetrical broadening of peaks. The nickelocene molecular configuration is probably eclipsed (D5h) in the ordered phase.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0021889876010984
