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- W2057984630 abstract "The distribution of Fe3+ and Ga3+ between the octahedral and tetrahedral sites in two garnets with the compositions Y3FeGa4O12 and Y3Fe3Ga2O12 was studied after heating at temperatures between 1000°C and 1500°C using Mössbauer and electronic absorption spectroscopy. Fe3+ shows preference for the octahedral sites and Ga3+ for the tetrahedral sites. At elevated temperatures, a more disordered distribution is observed. The standard Gibbs free energy change ΔG° per exchange pair according to the reaction Fe3+ (oct) + Ga3+ (tet)⇄ Ga3+(oct) + Fe3+ (tet) is 4.7 – 5.3kcal and the enthalpy change ΔH° is of the same magnitude. ΔH° may be correlated with the d-electron site preference for the tetrahedral coordination, which is considerably larger for d10 than for d5 configurated cations. The rather slow kinetics of the cation exchange between octahedral and tetrahedral sites at temperatures below 1200°C is probably due to the cornersharing topology of the coordination polyhedra." @default.
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- W2057984630 date "1982-01-01" @default.
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- W2057984630 title "The distribution of Fe<sup>3+</sup>and Ga<sup>3+</sup>between octahedral and tetrahedral sites in garnets, Y<sub>3</sub>(Fe,Ga)<sub>5</sub>O<sub>12</sub>, at different temperatures<sup>a</sup>" @default.
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- W2057984630 doi "https://doi.org/10.1524/zkri.1982.161.3-4.167" @default.
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