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Titolo:
Vanadium valency and hybridization in V-doped hafnia investigated by electron energy loss spectroscopy
Autore:
Gloter, A; Serin, V; Turquat, C; Cesari, C; Leroux, C; Nihoul, G;
Indirizzi:
CEMES, F-31055 Toulouse 4, France CEMES Toulouse France 4CEMES, F-31055 Toulouse 4, France Univ Toulon & Var, Lab Mat Microelect Provence, L2MP, F-83957 La Garde, France Univ Toulon & Var La Garde France F-83957 L2MP, F-83957 La Garde, France
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL B
fascicolo: 2, volume: 22, anno: 2001,
pagine: 179 - 186
SICI:
1434-6028(200107)22:2<179:VVAHIV>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-ABSORPTION; TRANSITION-METAL COMPOUNDS; INSULATOR-TRANSITION; PHASE-TRANSITIONS; V2O3; REFINEMENT; SPECTRA; OXIDES; VO2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Gloter, A CEMES, 29 Rue Jeanne Marvig,BP 4347, F-31055 Toulouse 4, France CEMES 29 Rue Jeanne Marvig,BP 4347 Toulouse France 4 4, France
Citazione:
A. Gloter et al., "Vanadium valency and hybridization in V-doped hafnia investigated by electron energy loss spectroscopy", EUR PHY J B, 22(2), 2001, pp. 179-186

Abstract

The valency of vanadium, and thus indirectly the oxygen stoichiometry, of V-doped hafnia synthesized under different atmospheres have been investigated on a nanometor scale by means of electron energy loss spectroscopy (EELS). The EELS V L-2,L-3 spectra are compared with the results of crystal field multiplet calculations and experiments oil reference vanadium oxides. TheEELS spectra indicate that V-doped hafnia prepared under reducing (H-2) and neutral (Ar) atmosphere are unambiguously substituted with trivalent vanadium atoms leading to the creation of oxygen vacancies in the structure. Onthe contrary, stoichiometric (Hf, V)O-2 compound (i.c. V4+) is more likelyto be stabilized under oxidative (air) atmospheres. We also show that the amount of hybridization alters for the different compounds studied but may in part be analyzed by high spatially resolved EELS. The crystal field multiplet calculations particularly indicate that a simple reduction of the Slater integrals gives a good account of the spectral modification induced by hybridization for the case of tetravalent vanadium atoms.

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Documento generato il 07/04/20 alle ore 23:01:44