| DOI | Trouver le DOI : https://doi.org/10.1016/j.jssc.2007.09.028 |
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| Auteur | Rechercher : Shafi, Shahid; Rechercher : Lundgren, Rylan; Rechercher : Cranswick, Lachlan1; Rechercher : Bieringer, Mario |
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| Affiliation | - Conseil national de recherches du Canada. Centre Canadien de faisceaux de neutrons du CNRC
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| Format | Texte, Article |
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| Sujet | Bixbyite structure; Defect fluorite structure; In-situ X-ray diffraction; InVO_(3.5+x); Low temperature magnetism; Powder neutron diffraction; ScVO_(3.5+x); Thermal analysis; Topotactic oxidation |
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| Résumé | We report the preparation and stability of ScVO3.5+x and the novel phase InVO3.5+x. AVO3.5+x (A=Sc, In) defect fluorite structures are formed as metastable intermediates during the topotactic oxidation of AVO3 bixbyites. The oxidation pathway has been studied in detail by means of thermogravimetric/differential thermal analysis and in-situ powder X-ray diffraction. The oxidation of the bixbyite phase follows a topotactic pathway at temperatures between 300 and 400 °C in air/carbon dioxide. The range of accessible oxygen stoichiometries for the AVO3.5+x structures following this pathway are 0.00[less-than-or-equals, slant]x[less-than-or-equals, slant]0.22. Rietveld refinements against powder X-ray and neutron data revealed that InVO3.54 and ScVO3.70 crystallize in the defect fluorite structure in space group Fm-3?m (227) with a=4.9863(5) and 4.9697(3)?, respectively with A3+/V4+ disorder on the (4a) cation site. Powder neutron diffraction experiments indicate clustering of oxide defects in all samples. Bulk magnetic measurements showed the presence of V4+ and the absence of magnetic ordering at low temperatures. Powder neutron diffraction experiments confirmed the absence of a long range ordered magnetic ground state. |
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| Date de publication | 2007-12 |
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| Dans | |
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| Numéro NPARC | 12338340 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 43e48e96-7590-4460-9278-6305e399ef7b |
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| Enregistrement créé | 2009-09-10 |
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| Enregistrement modifié | 2020-05-10 |
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