LEMÉE-CAILLEAU, Marie-Hélène; ECOLIVET, Claude; OULADDIAF, Bachir; MOUSSA, Fernande; LÉTARD, Jean-François

doi:10.1016/j.physb.2008.11.021

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LEMÉE-CAILLEAU, Marie-Hélène
Institut Laue-Langevin [ILL]

ECOLIVET, Claude
Groupe matière condensée et matériaux [GMCM]

OULADDIAF, Bachir
Institut Laue-Langevin [ILL]

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Physica B: Condensed Matter. 2009, vol. 404, n° 3-4, p. 379-381

Elsevier

Résumé en anglais

Transition metal complexes present solid state phase transitions associated with a change of the spin state, low-spin at low temperature to high-spin at high temperature, often with a significant change of metal-ligand bond lengths. Elastic interactions between small low-spin molecules and large high-spin ones play an important role in the phase transition. Since the discovery of spin crossover phenomenon, the complex [Fe (ptz)6](BF4)2 has successfully attracted the interest of scientists because of its complete spin conversion and of its sensitivity to light. This very rich phase multi-stability also offers a unique possibility to investigate carefully the spin crossover phenomena in diverse fundamental cases (coupled with a ferroelastic transition, after quenching, after irradiation, ...), and in an unusual case where the metal ion lies on a high-symmetry site. On the basis of results obtained by neutron scattering under high pressure, we present here the (pressure–temperature) phase diagram of the complex [Fe (ptz)6](BF4)2, which appears as seriously more complex than expected from the earlier literature, with in particular at least two new phases, one corresponding to complexes in a high-spin state but stacked in low symmetry, the other arising from an unexpected reconstructive phase transition.< Réduire

Mots clés en anglais

Spin transition

Crossover

Ferroelasticity

High pressure

Neutron scattering

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