By C Gleitzer; et al
Content material: Mixed-valence iron oxides / C. Gleitzer, J.B. Goodenough -- another method of non-molecular crystal constructions with emphasis at the preparations of cations / M. O'Keefe, B.G. Hyde -- Redox reactions of sulphur-containing amino-acid residues in proteins and metalloproteins, an XPS learn / U. Weser -- writer index, volumes 1-61
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In such a compound, a mixed Fe 3+a+ valence is only introduced through impurities and/or oxygen vacancies. 57 eV in the paramagnetic domain 178). 4. 5 +. 4. 4. In the interval Tp < T < Te, the Fe 3+ and Fe~+ ions give an unresolved sextet whose intensity increases with x, and the spectrum corresponds to Mg-rich domains with distinguishable Fe~+ and Feg+ ions together with Mg-poor domains with a mean valence Fe~'s+. These data support the idea that below 300 K strong elec~B ,,~a 1 where it can and tron-phonon coupling stabilizes the mixed-valence ratio •=~3+rv,2+ Mixed-Valence Iron Oxides 43 small polarons where it cannot; it also supports a model of electron hopping everywhere between iron atoms at temperatures above 300 K even though a AHm < kT may make the conductivity nearly temperature-independent.
2) in the concentration of localized 5T2gconfigurations at Fe 2÷ ions trapped near Ti 4+ ions. 9 ~< x <~ i confirm the presence of only localized configurations (Th > 10-8 S) at Fe 2+ ions at these larger x 164). 2, which provides direct evidence for a Th > 10-aS in Sn4+-rich regions. The importance of charge-transfer excited states appears from an analysis of the magnetic data, including the paramagnetic susceptibility, on the basis of N~el's theory. Basile et al) 57) determined the evolution with x of the FeB-Fes and FeA-FeA interactions in the system Fe3_xSnxO4.
380 a°7) for Zn[Fe2]O4. The formulation Znx2+Fex_x[Fel+xFel-x]O4 3+ 3+ 2+ appears to be nearly attainable with careful preparations. Substitution of a nonmagnetic divalent cation onto the A sites has three immediate consequences: (i) The Curie temperature Tc decreases as the density of FeA-O-FeB interactions is reduced Mixed-Valence Iron Oxides 31 (ii) The Fe~+-ion concentration is reduced (iii) The mobile-electron potential is perturbed As Tc decreases, the FeB-FeB interactions become more competitive with the FeA-O-FeB interactions.
Cation Ordering and Electron Transfer by C Gleitzer; et al