The kinetics features of a thermalspintransition characterized by opticalmicroscopy on the example of [Fe(bbtr)3](ClO4)2singlecrystals: Size effect and mechanical instability - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Chemical Physics Letters Année : 2011

The kinetics features of a thermalspintransition characterized by opticalmicroscopy on the example of [Fe(bbtr)3](ClO4)2singlecrystals: Size effect and mechanical instability

Résumé

We investigated by opticalmicroscopy the thermalspintransition in singlecrystals of [Fe(bbtr)3](ClO4)2 (bbtr = 1,4-di(1,2,3-triazol-1-yl) butane). The growth of the low-spin phase was observed for different crystal orientations and sizes. The process always started from a corner of the crystal but its further development depended on the size, shape and thermal history of the crystal. In crystals of smaller size, under isothermal conditions, the low-spin phase developed in a continuous way, through the propagation of a rather well defined transformation front, with a higher propagation velocity inside the planes perpendicular to the c axis. In larger crystals the spontaneous occurrence of inhomogeneousstresses led to a stepwise propagation process.

Dates et versions

hal-00713598 , version 1 (02-07-2012)

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Citer

Christian Chong, Ahmed Slimani, François Varret, Kamel Boukheddaden, Eric Collet, et al.. The kinetics features of a thermalspintransition characterized by opticalmicroscopy on the example of [Fe(bbtr)3](ClO4)2singlecrystals: Size effect and mechanical instability. Chemical Physics Letters, 2011, 504 (1-3), pp.29-33. ⟨10.1016/j.cplett.2011.01.041⟩. ⟨hal-00713598⟩
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