Abstract
The mechanism and kinetics of the thermally and light-induced spin transition of the highly cooperative spin crossover material $\mathrm{Fe}(\mathrm{btr}{)}_{2}(\mathrm{NCS}{)}_{2}∙{\mathrm{H}}_{2}\mathrm{O}$ ($\mathrm{btr}=4,4\mathrm{\ensuremath{'}}$--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.
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