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Dynamically slow solid-to-solid phase transition induced by thermal treatment of DimimFeCl4 magnetic ionic liquid.
de Pedro, Imanol; Fabelo, Oscar; García-Saiz, Abel; Vallcorba, Oriol; Junquera, Javier; Blanco, Jesús Angel; Waerenborgh, João Carlos; Andreica, D; Wildes, Andrew; Fernández-Díaz, María Teresa; Fernández, Jesús Rodríguez.
Afiliação
  • de Pedro I; CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain. depedrovm@unican.es.
  • Fabelo O; Institut Laue-Langevin, BP 156X, F-38042 Grenoble Cedex, France. fabelo@ill.fr.
  • García-Saiz A; CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain. depedrovm@unican.es.
  • Vallcorba O; ALBA Synchrotron Light Source, Cerdanyola del Vallés, Barcelona, Spain.
  • Junquera J; CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain. depedrovm@unican.es.
  • Blanco JA; Departamento de Física, Universidad de Oviedo, 33007 Oviedo, Spain.
  • Waerenborgh JC; Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal.
  • Andreica D; Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania.
  • Wildes A; Institut Laue-Langevin, BP 156X, F-38042 Grenoble Cedex, France. fabelo@ill.fr.
  • Fernández-Díaz MT; Institut Laue-Langevin, BP 156X, F-38042 Grenoble Cedex, France. fabelo@ill.fr.
  • Fernández JR; CITIMAC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain. depedrovm@unican.es.
Phys Chem Chem Phys ; 18(31): 21881-92, 2016 Aug 03.
Artigo em Inglês | MEDLINE | ID: mdl-27439896
ABSTRACT
The results reported here represent the first direct experimental observations supporting the existence of a solid-to-solid phase transition induced by thermal treatment in magnetic ionic liquids (MILs). The phase transitions of the solid phases of 1,3-dimethylimidazolium tetrachloroferrate, DimimFeCl4, are closely related to its thermal history. Two series of solid-to-solid phase transitions can be described in this MIL (i) from room temperature (RT) phase II [space group (s.g.) = P21] to phase I-a [s.g. = P212121] via thermal quenching or via fast cooling at T > 2 K min(-1); (ii) from phase I-a to phase I-b [s.g. = P21/c] when the temperature was kept above 180 K for several minutes. The latter involves a slow translational and reorientational dynamical process of both the imidazolium cation and the tetrachloroferrate anion and has been characterized using synchrotron and neutron powder diffraction and DFT (density functional theory) studies. The transition is also related to the modification of the super-exchange pathways of low-temperature phases which show a overall antiferromagnetic behavior. A combination of several experimental methods such as magnetometry, Mössbauer and muon spectroscopy together with polarized and non-polarized neutron powder diffraction has been used in order to characterize the different features observed in these phases.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Phys Chem Chem Phys Assunto da revista: Biofísica / Química Ano de publicação: 2016 Tipo de documento: Artigo País de afiliação: Espanha