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Title: Matrix-assisted relaxation in Fe(phen){sub 2}(NCS){sub 2} spin-crossover microparticles, experimental and theoretical investigations

Abstract

In this study, we present the influence of the embedding matrix on the relaxation of Fe(phen){sub 2}(NCS){sub 2} (phen = 1,10-phenanthroline) spin-transition microparticles as revealed by experiments and provide an explanation within the framework of an elastic model based on a Monte-Carlo method. Experiments show that the shape of the high-spin → low-spin relaxation curves is drastically changed when the particles are dispersed in glycerol. This effect was considered in the model by means of interactions between the microparticles and the matrix. A faster start of the relaxation for microparticles embedded in glycerol is due to an initial positive local pressure acting on the edge spin-crossover molecules from the matrix side. This local pressure diminishes and eventually becomes negative during relaxation, as an effect of the decrease of the volume of spin-crossover microparticles from high-spin to low-spin.

Authors:
;  [1];  [1];  [2];  [3];  [4]; ;  [3]
  1. Faculty of Physics, “Alexandru Ioan Cuza” University, 700506 Iasi (Romania)
  2. (United Kingdom)
  3. Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, Université Paris-Saclay, CNRS, 91405 Orsay (France)
  4. (France)
Publication Date:
OSTI Identifier:
22594415
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 109; Journal Issue: 3; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GLYCEROL; MATRICES; MOLECULES; MONTE CARLO METHOD; PARTICLES; PHENANTHROLINES; RELAXATION; SPIN

Citation Formats

Enachescu, Cristian, E-mail: cristian.enachescu@uaic.ro, Stancu, Alexandru, Tanasa, Radu, Department of Engineering, University of Cambridge, CB2 1PZ Cambridge, Tissot, Antoine, Institut Lavoisier de Versailles, UMR 8180, CNRS, Université de Versailles-Saint Quentin en Yvelines, 78035 Versailles, Laisney, Jérôme, and Boillot, Marie-Laure, E-mail: marie-laure.boillot@u-psud.fr. Matrix-assisted relaxation in Fe(phen){sub 2}(NCS){sub 2} spin-crossover microparticles, experimental and theoretical investigations. United States: N. p., 2016. Web. doi:10.1063/1.4959262.
Enachescu, Cristian, E-mail: cristian.enachescu@uaic.ro, Stancu, Alexandru, Tanasa, Radu, Department of Engineering, University of Cambridge, CB2 1PZ Cambridge, Tissot, Antoine, Institut Lavoisier de Versailles, UMR 8180, CNRS, Université de Versailles-Saint Quentin en Yvelines, 78035 Versailles, Laisney, Jérôme, & Boillot, Marie-Laure, E-mail: marie-laure.boillot@u-psud.fr. Matrix-assisted relaxation in Fe(phen){sub 2}(NCS){sub 2} spin-crossover microparticles, experimental and theoretical investigations. United States. doi:10.1063/1.4959262.
Enachescu, Cristian, E-mail: cristian.enachescu@uaic.ro, Stancu, Alexandru, Tanasa, Radu, Department of Engineering, University of Cambridge, CB2 1PZ Cambridge, Tissot, Antoine, Institut Lavoisier de Versailles, UMR 8180, CNRS, Université de Versailles-Saint Quentin en Yvelines, 78035 Versailles, Laisney, Jérôme, and Boillot, Marie-Laure, E-mail: marie-laure.boillot@u-psud.fr. 2016. "Matrix-assisted relaxation in Fe(phen){sub 2}(NCS){sub 2} spin-crossover microparticles, experimental and theoretical investigations". United States. doi:10.1063/1.4959262.
@article{osti_22594415,
title = {Matrix-assisted relaxation in Fe(phen){sub 2}(NCS){sub 2} spin-crossover microparticles, experimental and theoretical investigations},
author = {Enachescu, Cristian, E-mail: cristian.enachescu@uaic.ro and Stancu, Alexandru and Tanasa, Radu and Department of Engineering, University of Cambridge, CB2 1PZ Cambridge and Tissot, Antoine and Institut Lavoisier de Versailles, UMR 8180, CNRS, Université de Versailles-Saint Quentin en Yvelines, 78035 Versailles and Laisney, Jérôme and Boillot, Marie-Laure, E-mail: marie-laure.boillot@u-psud.fr},
abstractNote = {In this study, we present the influence of the embedding matrix on the relaxation of Fe(phen){sub 2}(NCS){sub 2} (phen = 1,10-phenanthroline) spin-transition microparticles as revealed by experiments and provide an explanation within the framework of an elastic model based on a Monte-Carlo method. Experiments show that the shape of the high-spin → low-spin relaxation curves is drastically changed when the particles are dispersed in glycerol. This effect was considered in the model by means of interactions between the microparticles and the matrix. A faster start of the relaxation for microparticles embedded in glycerol is due to an initial positive local pressure acting on the edge spin-crossover molecules from the matrix side. This local pressure diminishes and eventually becomes negative during relaxation, as an effect of the decrease of the volume of spin-crossover microparticles from high-spin to low-spin.},
doi = {10.1063/1.4959262},
journal = {Applied Physics Letters},
number = 3,
volume = 109,
place = {United States},
year = 2016,
month = 7
}