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Meddar, L., Josse, M., Maglione, M., Guiet, A., La, C., Deniard, P., Decourt, R., Lee, C., Tian, C., Jobic, S., Whangbo, M.-H. & Payen, C. (2012) Increasing the Phase-Transition Temperatures in Spin-Frustrated Multiferroic MnWO4 by Mo Doping. Chem. Mat. 24 353–360.
Added by: Laurent Cournède (2016-03-10 21:28:40) |
| Type de référence: Article DOI: 10.1021/cm2031653 Numéro d'identification (ISBN etc.): 0897-4756 Clé BibTeX: Meddar2012 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: crystal-structure, diffraction, high-pressure, inductive effect, magnetic exchange, MnWO4, molybdates, multiferroic, optical-properties, oxide, spin frustration Créateurs: Decourt, Deniard, Guiet, Jobic, Josse, La, Lee, Maglione, Meddar, Payen, Tian, Whangbo Collection: Chem. Mat. |
Consultations : 1/596
Indice de consultation : 4% Indice de popularité : 1% |
| Résumé |
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Ceramic samples of MnW1-xMoxO4 (x {<}= 0.3) solid solution were prepared by a solid-state route with the goal of increasing the magnitude of the spin-exchange couplings among the Mn2+ ions in the spin spiral multiferroic MnWO4. Samples were characterized by X-ray diffraction, optical spectroscopy, magnetization, and dielectric permittivity measurements. It was observed that the Neel temperature T-N, the spin spiral ordering temperature T-M2, and the ferroelectric phase-transition temperature T-FE2 of MnWO4 increased upon the nonmagnetic substitution of Mo6+ for W6+. Like pure MnWO4, the ferroelectric critical temperature T-FE2(x) coincides with the magnetic ordering temperature T-M2(x). A density functional analysis of the spin-exchange interactions for a hypothetical MnMoO4 that is isostructural with MnWO4 suggests that Mo substitution increases the strength of the spin-exchange couplings among Mn2+ in the vicinity of a Mo6+ ion. Our study shows that the Mo-doped MnW1-xMoxO4 (x {<}= 0.3) compounds are spin-frustrated materials that have higher magnetic and ferroelectric phase-transition temperatures than does pure MnWO4.
Added by: Laurent Cournède |