## Peierls transition

https://doi.org/10.1351/goldbook.P04468
A @M03863@ in quasi one-dimensional solids that occurs as a result of a band gap opening up at the @F02340@ due to a displacive distortion of the regular array increasing the @U06562@ length, usually a @D01744@; the decrease in electronic energy outweighs the increase in lattice energy. Example: The transition in methylethylmorpholinium tetracyanoquinodimethanide at $$335\ \text{K}$$.
Source:
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 588 [Terms] [Paper]