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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2023

Lattice defects in sub-micrometer spin-crossover crystals studied by electron diffraction

Résumé

Spin-crossover particles of [Fe(Htrz)2trz](BF4) with sizes of some hundred nanometers are studied by in-situ electron microscopy. Despite their high radiation sensitivity, it was possible to analyze the particles in imaging and diffraction so that a detailed analysis of crystallographic defects in individual particles became possible. The presence of one or several tilt boundaries, where the tilt axis is the direction of the polymer chains, is detected in each particle. An in-situ exposure of the particles to temperature variations or short laser pulses to induce the spin crossover shows that the defect structure only changes after a high number of transformations between the low-spin and high-spin phases. The observations are explained by the anisotropy of the atomic architecture within the crystals that facilitates defects between weakly linked crystallographic planes. TOC graphic

Domaines

Matériaux
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Dates et versions

hal-04195356 , version 2 (04-09-2023)
hal-04195356 , version 1 (05-09-2023)

Identifiants

Citer

Hilaire Mba, Matthieu Picher, Nathalie Daro, Mathieu Marchivie, Philippe Guionneau, et al.. Lattice defects in sub-micrometer spin-crossover crystals studied by electron diffraction. Journal of Physical Chemistry Letters, 2023, 14 (36), pp.8100-8106. ⟨10.1021/acs.jpclett.3c01942⟩. ⟨hal-04195356v2⟩
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