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- W2000625372 abstract "The bulk properties of two series of solid solutions with scheelite tetragonal structure and general formula Bi1 − x3□x3 − yMey(V1 − xMox − yFey)O4, where Me = Bi (series I) or Me = Fe (series II), were investigated by electron spin resonance (ESR) and magnetic susceptibility measurements. The incorporation of Fe3+ ions with high-spin configuration into the structure of bismuth molybdovanadates gives rise to three distinct ESR signals (α, β, γ). Their presence and intensity depend on the iron content (y parameter) and even more on its location into the tetrahedral B sites (series I) or into both the tetrahedral, B, and eight-coordinated A sites (series II) of the scheelite structure. Signal α, present in both catalyst series and having g1 = 4.2 and ΔH≅ 200 G at room temperature, is assigned to isolated Fe3+ in B sites. Signal β, present only in the catalysts of series II and having g = 2.0, is assigned to strongly coupled Fe3+ ions in both A and B sites (AOxB antiferromagnetic coupling type). Signal γ, being present in the series I catalysts and having g ≅ 2 and ΔH = 2000 G, is assigned to Fe3+ weakly coupled in B sites. Moreover, the behavior of the Weiss temperature θ for the two catalyst series and its dependence on x and y compositional parameters lead to the same conclusions about the location and dispersion of Fe3+ ions in the scheelite structure, as obtained by ESR. A plausible hypothesis on the mechanism through which the dispersion of Fe3+ occurs in the molybdovanadate systems is presented." @default.
- W2000625372 created "2016-06-24" @default.
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- W2000625372 date "1986-11-01" @default.
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- W2000625372 title "Structural, surface, and catalytic properties of bismuth molybdovanadates containing foreign atoms *1III. Electron spin resonance and magnetic characterization of iron-containing bismuth molybdovanadate catalysts" @default.
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- W2000625372 doi "https://doi.org/10.1016/0021-9517(86)90134-x" @default.
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