Endres, HelmutKeller, Heimo J.Swietlik, RomanSchweitzer, DieterAngermund, KlausKrüger, Carl2011-07-212016-03-312011-07-212016-03-311986352432225http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-64588http://elib.uni-stuttgart.de/handle/11682/7624http://dx.doi.org/10.18419/opus-7607The structure of single crystals of the organic metals α- and β-(BEDT-TTF) was determined at 100 K, well below the phase transitions indicated by resistivity and thermopower measurements as well as by differential thermal analysis. In the α-phase no unusual change of the room temperature unit cell but a slight variation in the triiodide network and especially a more pronounced dimerization in one of the two donor stacks have been found. The β-phase develops a superstructure with a unit cell volume three times as large as that at room temperature and with pronounced distortions of the I3--ions.eninfo:eu-repo/semantics/openAccessTetrathiafulvalen , Organischer Supraleiter530article