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Title

The kinetics features of a thermal spin transition characterized by optical microscopy on the example of [Fe(bbtr)3](ClO4)2 single crystals: Size effect and mechanical instability

Authors
Chong, Christian
Slimani, Ahmed
Varret, François
Boukheddaden, Kamel
Collet, Eric
Ameline, Jean-Claude
Bronisz, Robert
Published in Chemical Physics Letters. 2011, vol. 504, no. 1-3, p. 29-33
Abstract We investigated by optical microscopy the thermal spin transition in single crystals 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 inhomogeneous stresses led to a stepwise propagation process.
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Research group Groupe Hauser
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CHONG, Christian et al. The kinetics features of a thermal spin transition characterized by optical microscopy on the example of [Fe(bbtr)3](ClO4)2 single crystals: Size effect and mechanical instability. In: Chemical Physics Letters, 2011, vol. 504, n° 1-3, p. 29-33. https://archive-ouverte.unige.ch/unige:16831

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Deposited on : 2011-08-29

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