Nous présentons des mesures de compressibilité de TTF-TCNQ deutéré par diffraction de neutrons sous hautes pressions hydrostatiques jusqu'à ~ 20 kbar à la température ambiante. Les valeurs observées sont respectivement suivant les axes a, b et c, ka = 2,7, kb = 4,7 et kc = 3,2 x 10-12 cm2/dyne. Ces résultats indiquent l'existence d'une contribution importante de type électrostatique (coulomb) à l'interaction interchaînes. Nous suggérons que la cohésion des cristaux de TTF-TCNQ provient de l'empilement de dipôles moléculaires fluctuants. Abstract.-The linear axial compressibilities of a deuterated sample of TTF-TCNQ (tetrathiafulvalene-tetracyanoquinodimethane) have been measured by a neutron diffraction technique under hydrostatic pressures up to ~ 20 kbar at room temperature. The observed compressibilities along the crystallographic axes are, respectively, ka = 2.7, kb = 4.7 and kc = 3.2 x 10-12 cm2/dyne. These results indicate a strong Coulomb type interchain interaction. It is suggested that the dominant part of the crystal cohesion results from a stacking of strongly dynamically polarized TTF and TCNQ molecules acting as effective molecular dipoles.
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