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Titolo:
THE STATE OF THE OXYGEN AT THE SURFACE OF POLYCRYSTALLINE COBALT OXIDE
Autore:
JIMENEZ VM; FERNANDEZ A; ESPINOS JP; GONZALEZELIPE AR;
Indirizzi:
UNIV SEVILLA,CSIC,INST CIENCIA MAT,POB 1115 E-41080 SEVILLE SPAIN UNIV SEVILLA,CSIC,INST CIENCIA MAT E-41080 SEVILLE SPAIN DEPT Q INORGAN E-41080 SEVILLE SPAIN
Titolo Testata:
Journal of electron spectroscopy and related phenomena
fascicolo: 1, volume: 71, anno: 1995,
pagine: 61 - 71
SICI:
0368-2048(1995)71:1<61:TSOTOA>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRONIC-STRUCTURE; XPS; COO; PHOTOEMISSION; DECOMPOSITION; SPECTROSCOPY; DEPENDENCE; SPECTRA; LICOO2; SHIFTS;
Keywords:
COBALT OXIDE; DTA; FACTOR ANALYSIS; POLYCRYSTALLINE; TG; XPS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
V.M. Jimenez et al., "THE STATE OF THE OXYGEN AT THE SURFACE OF POLYCRYSTALLINE COBALT OXIDE", Journal of electron spectroscopy and related phenomena, 71(1), 1995, pp. 61-71

Abstract

XPS and factor analysis (FA) have been applied to characterize the surface state of three polycrystalline cobalt oxide samples with different crystallographic bulk structure (CO3O4 and CoO) and surface characteristics. The study of the thermal behaviour of the O1s and Co2p spectra and of their changes as an effect of Ar+ bombardment and exposure to O-2 have permitted verification of the existence of three componentsat: the O Is spectra with binding energies at 529.6 (O-I), 531.1 (O-II) and 532.1 eV (O-III) and three components at the Co2p level. The shape of these components is similar to the Co2p spectra of Co3O4 (Co-III), CoO (Co-II) and Co-0 (Co-I) compounds. In the three samples component O-II yields component O-III by heating at 473 K < T < 673 K. Then,the intensity of species O-III and O-I decreases to a minimum at 923 K. Simultaneously, component Co-III, the most abundant in the originalsamples, yields component Co-II by outgassing at T > 473 K. Con is the only one detected at 923 K. After Ar+ sputtering of the samples heated;at that temperature, components Co-III and Co-I were generated. Co-I disappears, while the intensity of components O-II and Co-III increases when the samples are exposed to O-2. The most intense O-I species is attributed to oxygen atoms in sites with a well defined coordination. Species O-II and O-III are attributed to low coordinated oxygen atoms at special sites or domains of the surface where the covalence of the Co-O bond is higher. Differences in the relative abundance of the three oxygen components, either during outgassing or after Ar+ sputtering, are dependent on the texture of the three samples expressed in terms of their respective surface areas.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 22:21:27