D. Le Pevelen et al., Influence of the pressure on the low temperature (7K) crystal structure ofthe superconducting molecular salt (TMTSF)(2)ClO4, SYNTH METAL, 102(1-3), 1999, pp. 1609-1610
The anion ordering which occurs in (TMTSF)(2)ClO4 at 24 K is characterized
by the appearance of b*/2 superlattice reflections, without any important c
hange in the basic crystal structure. The intensities of these superlattice
reflections have been measured at 7 K (ambient pressure). At the same temp
erature, these reflections do not appear under pressure (5 kbar). Thus, in
the latter case, the anions remain disordered.