Kinetics of light-induced first-order phase transformation in molecular solids: Fe(btr)2(NCS)2∙H2O

Sébastien Pillet (1) , Vincent Legrand (1) , Mohamed Souhassou (1) , Claude Lecomte (1)

1 CRM2 - Cristallographie, Résonance Magnétique et Modélisations

The mechanism and kinetics of the thermally and light-induced spin transition of the highly cooperative spin crossover material Fe(btr)2(NCS)2∙H2O (btr=4,4'–bis–1,2,4–triazole) have been investigated by single crystal x-ray diffraction techniques. The key role of like-spin domains is quantitatively analyzed through a nucleation, growing, and coarsening mechanism whose kinetics follow the Kolmogorov-Johnson-Mehl-Avrami model with low dimensional characteristics.

Domaines: Mécanique [physics.med-ph]; Matériaux

Sébastien Pillet, Vincent Legrand, Mohamed Souhassou, Claude Lecomte. Kinetics of light-induced first-order phase transformation in molecular solids: Fe(btr)2(NCS)2∙H2O. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2006, 74 (14), ⟨10.1103/PhysRevB.74.140101⟩. ⟨hal-01007006⟩