A
metal-insulator transition in quasi one-dimensional solids that occurs as a result of a band gap opening up
at the
Fermi energy due to a displacive distortion of the regular array increasing the
unit cell length, usually a
dimerization; the decrease in electronic energy outweighs the increase in lattice energy. Example:
The transition in methylethylmorpholinium tetracyanoquinodimethanide at
.
Source:
PAC, 1994, 66, 577
(Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations
1994))
on page 588