Abstract
At solid state, transition metal complexes present phase transitions associated with a change of the spin state, often with a significant change of metal-ligand bond lengths: low-spin state (LS) at low temperature, high-spin state (HS) at high temperature. Elastic interactions between small LS molecules and large HS ones also play an important role in this phase transition that may be accompanied by a simultaneous first-order structural reorganisation. Because of its octaedral coordination, [Fe(ptz) 6](BF 4) 2 is a good prototype of spin transition associated with a ferroelastic phase transition at atmospheric pressure. In addition to the evidence of a new reconstructive phase transition, which turns the single-crystal sample into powder under high pressure, the here presented neutron scattering experiments have clearly shown that the ferroelastic phase transition can be fully dissociated from the spin transition under moderate pressure, with the creation of a new intermediate distorted HS phase. Moreover, hysteresis phenomena are stricly associated with the ferroelastic phase transition and do not depend on pressure.
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