## Verwey transition

https://doi.org/10.1351/goldbook.V06612
An electron-ordering transition occurring in a mixed-valent system that results in an ordering of formal @V06588@ states in the low-temperature phase. Example: The prototype system, first identified by Verwey, is the ferrospinel magnetite, Fe3+[Fe3+Fe2+]O4 in which an ordering of Fe3+ and Fe2+ ions within octahedral sites is thought to occur below $$T_{\text{v}}\approx 120\ \text{K}$$.
Source:
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 593 [Terms] [Paper]