M ay 2 00 9 Pressure-induced structural phase transition in the Bechgaard-Fabre salts


The crystal structures of the quasi-one-dimensional organic salts (TMTTF)2PF6 and (TMTSF)2PF6 were studied by pressure-dependent x-ray diffraction up to 10 GPa at room temperature. The unit-cell parameters exhibit a clear anomaly due to a structural phase transition at 8.5 and 5.5 GPa for (TMTTF)2PF6 and (TMTSF)2PF6, respectively. 

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