Structural, thermal, magnetic and electrical studies of the iron oxophosphate Rb<sub>7</sub>Fe<sub>7</sub>(PO<sub>4</sub>)<sub>8</sub>O<sub>2</sub>·2H<sub>2</sub>O
| hal.structure.identifier | Matériaux Inorganiques | |
| dc.contributor.author | HIDOURI, Mourad | |
| hal.structure.identifier | Matériaux Inorganiques | |
| dc.contributor.author | LAJMI, Besma | |
| hal.structure.identifier | Matériaux Inorganiques | |
| dc.contributor.author | GMATI, Nadia | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | WATTIAUX, Alain | |
| hal.structure.identifier | Institut Laue-Langevin [ILL] | |
| dc.contributor.author | NENERT, Gwilherm | |
| hal.structure.identifier | Institut Laue-Langevin [ILL] | |
| dc.contributor.author | RITTER, Clemens | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | FOURNÈS, Léopold | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DARRIET, Jacques | |
| hal.structure.identifier | Departamento de Química Inorgánica I | |
| dc.contributor.author | LOPEZ MARIA, Luisa | |
| hal.structure.identifier | Departamento de Química Inorgánica I | |
| dc.contributor.author | PICO, Carlos | |
| hal.structure.identifier | Matériaux Inorganiques | |
| dc.contributor.author | BEN AMARA, Mongi | |
| dc.date.issued | 2010 | |
| dc.identifier.issn | 0025-5408 | |
| dc.description.abstractEn | A new iron oxophosphate of composition Rb<sub>7</sub>Fe<sub>7</sub>(PO<sub>4</sub>)<sub>8</sub>O<sub>2</sub>·2H<sub>2</sub>O has been synthesized and studied by X-ray diffraction, TG and DTA analysis, magnetic susceptibility, neutron diffraction, Mössbauer spectroscopy and ionic conductivity. This compound crystallizes in the monoclinic system with the <i>P</i>2<sub>1</sub>/<i>c</i> space group and the unit cell parameters <i>a</i> = 8.224(8) Å, <i>b</i> = 22.162(6) Å, <i>c</i> = 9.962(6) Å and <i>β</i> = 109.41(8)°. Its structure is built up from Fe<sub>7</sub>O<sub>32</sub> clusters of edge- and corner-sharing FeO<sub>5</sub> and FeO<sub>6</sub> polyhedra. Neighboring clusters are connected by the phosphate tetrahedra to form a three-dimensional framework. The Rb<sup>+</sup> cations and the water molecules are occupying intersecting tunnels parallel to <i>a</i> and <i>c</i>. The presence of water molecules was confirmed by TG and DTA analysis. The magnetic susceptibility measurements have shown the existence of antiferromagnetic ordering below 22 K with a weak ferromagnetic component. Additionally, these measurements show evidence for a strong magnetic frustration characterized by |<i>θ</i>/<i>T</i><sub>N</sub>| ≈ 12. Powder neutron diffraction study confirms the presence of a long range antiferromagnetic order coupled to a weak ferromagnetic component along the <i>b</i>-axis. The strongly reduced magnetic moments extracted from the refinement support the existence of a magnetically frustrated ground state. The Mössbauer spectroscopy results confirmed the presence of only Fe<sup>3+</sup> ions in both five and six coordination. The ionic conductivity measurements led to activation energy of 0.81 eV, a value that agrees with the obtained for other rubidium phosphates. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Chemical synthesis | |
| dc.subject.en | Mössbauer spectroscopy | |
| dc.subject.en | Impedance spectroscopy | |
| dc.subject.en | Neutron scattering | |
| dc.subject.en | Magnetic structure | |
| dc.title.en | Structural, thermal, magnetic and electrical studies of the iron oxophosphate Rb<sub>7</sub>Fe<sub>7</sub>(PO<sub>4</sub>)<sub>8</sub>O<sub>2</sub>·2H<sub>2</sub>O | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.materresbull.2010.05.008 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Materials Research Bulletin | |
| bordeaux.page | 1255-1262 | |
| bordeaux.volume | 45 | |
| bordeaux.issue | 9 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00528351 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00528351v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Materials%20Research%20Bulletin&rft.date=2010&rft.volume=45&rft.issue=9&rft.spage=1255-1262&rft.epage=1255-1262&rft.eissn=0025-5408&rft.issn=0025-5408&rft.au=HIDOURI,%20Mourad&LAJMI,%20Besma&GMATI,%20Nadia&WATTIAUX,%20Alain&NENERT,%20Gwilherm&rft.genre=article |
Fichier(s) constituant ce document
| Fichiers | Taille | Format | Vue |
|---|---|---|---|
|
Il n'y a pas de fichiers associés à ce document. |
|||