Phase Stability of Spin-Crossover Nanoparticles Investigated by Synchrotron Mössbauer Spectroscopy and Small-Angle Neutron Scattering - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2019

Phase Stability of Spin-Crossover Nanoparticles Investigated by Synchrotron Mössbauer Spectroscopy and Small-Angle Neutron Scattering

Karl Ridier
Grégory Chaboussant
William Nicolazzi
Lionel Salmon
Gábor Molnár

Résumé

Spin-crossover nanomaterials have been actively studied in the past decade for their potential technological applications in sensing, actuating, and information processing devices. Unfortunately, an increasing number of the metallic centers become inactive at reduced sizes, presumably due to surface effects, limiting their switching ability and thus the scope of applications. Here we report on the investigation of “frozen” metallic centers in nanoparticles (2–80 nm size) of the spin-crossover compound Fe(pyrazine)[Ni(CN)4]. Magnetic measurements reveal both high-spin and low-spin residual fractions at atmospheric pressure. A pressure-induced transition of the high-spin residue is observed at around 1.5 GPa by synchrotron Mössbauer spectroscopy. We show that it is equivalent to a downshift of the transition temperature by ca. 400 K due to the size reduction. Unexpectedly, small-angle neutron scattering experiments demonstrate that these high-spin residual centers are not confined to the surface, which contradicts general theoretical considerations.
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Dates et versions

hal-02111198 , version 1 (19-11-2020)

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Mirko Mikolasek, Karl Ridier, Dimitrios Bessas, Valerio Cerantola, Gautier Félix, et al.. Phase Stability of Spin-Crossover Nanoparticles Investigated by Synchrotron Mössbauer Spectroscopy and Small-Angle Neutron Scattering. Journal of Physical Chemistry Letters, 2019, 10 (7), pp.1511-1515. ⟨10.1021/acs.jpclett.9b00335⟩. ⟨hal-02111198⟩
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