The Role of Order-Disorder Transitions in the Quest for Molecular Multiferroics: Structural and Magnetic Neutron Studies of a Mixed Valence Iron(II)-Iron(III) Formate Framework.
Neutron diffraction studies have been carried out to shed light on the unprecedented order-disorder phase transition (ca. 155 K) observed in the mixed-valence iron(II)-iron(III) formate framework compound [NH(CH)][FeFe(HCOO)]. The crystal structure at 220 K was first determined from Laue diffraction...
| Publicado en: | Journal of the American Chemical Society Vol. 134; no. 48; pp. 19772 - 19782 |
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| Autores principales: | , , , , , , , , , , , |
| Formato: | Artículo |
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American Chemical Society
12/5/2012
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=84231982&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 84231982 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 12/5/2012 vid: 134 iid: 48 pid: 997 pub: American Chemical Society artinfo: ui: 84231982 10.1021/ja3082457 ppf: 19772 ppct: 10 formats: tig: atl: The Role of Order-Disorder Transitions in the Quest for Molecular Multiferroics: Structural and Magnetic Neutron Studies of a Mixed Valence Iron(II)-Iron(III) Formate Framework. aug: au: Cañadillas-Delgado, Laura Fabelo, Oscar Rodríguez-Velamazán, J. Alberto Lemèe-Cailleau, Marie-Hélène Mason, Sax A. Pardo, Emilio Lloret, Francesc Jiong-Peng Zhao Xian-He Bu Simonet, Virginie Colin, Claire V. Rodríguez-Carvajal, Juan affil: Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, C/Pedro Cerbuna 12, E-50009, Zaragoza, Spain Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France Centro Universitario de la Defensa de Zaragoza. Ctra de Huesca s/n. 50090 Zaragoza, Spain Instituto de Ciencia Molecular (ICMOL), Universitat de València, 46980 Paterna, València, Spain Department of Chemistry, and TKL of Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, China Institut Néel, CNRS and UJF, BP 166, 38042 Grenoble Cedex 9, France su: Multiferroic materials Neutron diffraction Optical diffraction Iron Valence (Chemistry) sug: subj: Multiferroic materials Neutron diffraction Optical diffraction Iron Valence (Chemistry) ab: Neutron diffraction studies have been carried out to shed light on the unprecedented order-disorder phase transition (ca. 155 K) observed in the mixed-valence iron(II)-iron(III) formate framework compound [NH(CH)][FeFe(HCOO)]. The crystal structure at 220 K was first determined from Laue diffraction data, then a second refinement at 175 K and the crystal structure determination in the low temperature phase at 45 K were done with data from the monochromatic high resolution single crystal diffractometer D19. The 45 K nuclear structure reveals that the phase transition is associated with the order-disorder of the dimethylammonium counterion that is weakly anchored in the cavities of the [FeFe(HCOO)] framework. In the low-temperature phase, a change in space group from P31c to R3c occurs, involving a tripling of the c-axis due to the ordering of the dimethylammonium counterion. The occurrence of this nuclear phase transition is associated with an electric transition, from paraelectric to antiferroelectric. A combination of powder and single crystal neutron diffraction measurements below the magnetic order transition (ca. 37 K) has been used to determine unequivocally the magnetic structure of this Néel N-Type ferrimagnet, proving that the ferrimagnetic behavior is due to a noncompensation of the different Fe and Fe magnetic moments. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2012 holdings: @attributes: islocal: N |
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