Issue 14, 2018
From the journal:

Physical Chemistry Chemical Physics

Scan-rate and vacuum pressure dependence of the nucleation and growth dynamics in a spin-crossover single crystal: the role of latent heat†

Karl Ridier, ORCID logo a   Sylvain Rat,a   Lionel Salmon, ORCID logo a   William Nicolazzi,a   Gábor Molnár ORCID logo a  and  Azzedine Bousseksou*a  

* Corresponding authors

a Laboratoire de Chimie de Coordination (LCC-CNRS), Université de Toulouse, UPS, INP, F-31077 Toulouse, France
E-mail: azzedine.bousseksou@lcc-toulouse.fr

Abstract

Using optical microscopy we studied the vacuum pressure dependence (0.1–1000 mbar) of the nucleation and growth dynamics of the thermally induced first-order spin transition in a single crystal of the spin-crossover compound [Fe(HB(tz)3)2] (tz = 1,2,4-triazol-1-yl). A crossover between a quasi-static hysteresis regime and a temperature-scan-rate-dependent kinetic regime is evidenced around 5 mbar due to the change of the heat exchange coupling between the crystal and its external environment. Remarkably, the absorption/dissipation rate of latent heat was identified as the key factor limiting the switching speed of the crystal.

Graphical abstract: Scan-rate and vacuum pressure dependence of the nucleation and growth dynamics in a spin-crossover single crystal: the role of latent heat

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Article information

DOI
https://doi.org/10.1039/C7CP08522B
Article type
Paper
Submitted
20 Dec 2017
Accepted
18 Mar 2018
First published
20 Mar 2018

Phys. Chem. Chem. Phys., 2018,20, 9139-9145

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Scan-rate and vacuum pressure dependence of the nucleation and growth dynamics in a spin-crossover single crystal: the role of latent heat

K. Ridier, S. Rat, L. Salmon, W. Nicolazzi, G. Molnár and A. Bousseksou, Phys. Chem. Chem. Phys., 2018, 20, 9139 DOI: 10.1039/C7CP08522B

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