Evidence for structural transitions in onedimensional organic conductor TMA-TCNQ-I obtained by high voltage electron diffraction at low temperature

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Abstract
By using a very high accelerating voltage in electron diffraction, it has been possible, for the first time, to study structural change with temperature of a onedimensional organic conductor, the trimethylammonium-iodide-tetracyanoquinodimethane TMA+(TCNQ)2/3-(I-3)1/3. This exhibits a structural distortion at low temperature. The components of the distortion vector are 0 ; ± 1/3 b* ; 0 when 150 K > T > 100 K, then ± (xa* ; 1/3 b* ; 0) with 0 < x < 1/6 on going from 100 K to 80 K and finally ± (1/6 a*; 1/3 b* ; 0)