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Size effect in spin-crossover systems investigated by FORC measurements, for surfacted [Fe(NH2-trz)3](Br)2*3H2O nanoparticles: reversible contributions and critical size

hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
hal.structure.identifierDepartment of Physics
hal.structure.identifierFaculty of Electrical Engineering and Computer Science [Suceava]
dc.contributor.authorROTARU, Aurelian
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
dc.contributor.authorVARRET, Francois
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
hal.structure.identifierFaculty of Electrical Engineering and Computer Science [Suceava]
dc.contributor.authorGINDULESCU, A.
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
dc.contributor.authorLINARES, Jorge
hal.structure.identifierDepartment of Physics
dc.contributor.authorSTANCU, Alexandru
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLÉTARD, Jean-François
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFORESTIER, Thibaut
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorETRILLARD, Céline
dc.date.issued2011
dc.identifier.issn1434-6028
dc.description.abstractEnWe investigated the thermal transition of coated nano-particles of the title compound, on a set of samples of average diameter ⟨d⟩ ~ 30, 50, 70, 110 nm, with rather broad size distributions. As expected, the width of the major hysteresis loop was an increasing function of ⟨d⟩. We recorded first-order reversal curves (FORC), the initial parts of which displayed a finite slope, revealing the presence of reversible contributions expected from particles smaller than the critical size dC associated with the collapse of the hysteresis loop. Kinetic effects were also evidenced thanks to isothermal stages. Reversibility of the FORC curves at the vicinity of the reversal temperature was controlled. Thanks to the reversibility property we could determine the reversible contributions to the total response of all samples and derive the corresponding dC values. Consistent results were obtained by accounting for an anhysteretic contribution from the large particles, leading to an accurate determination dC ~ 45−50 nm, much better than the width of the size distributions.
dc.language.isoen
dc.publisherSpringer-Verlag
dc.subject.enThermal transitions
dc.subject.enNanoparticles
dc.subject.enChemical compounds
dc.subject.enSpin-crossover systems
dc.title.enSize effect in spin-crossover systems investigated by FORC measurements, for surfacted [Fe(NH2-trz)3](Br)2*3H2O nanoparticles: reversible contributions and critical size
dc.typeArticle de revue
dc.identifier.doi10.1140/epjb/e2011-10903-x
dc.subject.halChimie/Matériaux
bordeaux.journalThe European Physical Journal B: Condensed Matter and Complex Systems
bordeaux.page439-449
bordeaux.volume84
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-00661477
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00661477v1
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