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- W2050584081 abstract "Reinvestigation of the Jahn-Teller distortion of the copper ferrospinel has established that the critical number of octahedral-site Cu2+ ions per formula unit for a cooperative distortion to tetragonal symmetry at room temperature is ca 0.8. Several anomalies associated with the tetragonal-cubic transition have been noted in the literature; these anomalies are shown to reflect not only a tendency for segregation into Cu-rich and Cu-poor regions in the neighborhood of Tt, but also a quenching in of both tetrahedral-site Cu2+ and oxygen vacancies on rapid cooling. The intersite exchange Cu2+A + Fe3+B = Cu2+B + Fe3+A to reestablish equilibrium becomes facile near 250°C; reoxidation becomes facile near 325°C. This temperature resolution of the two processes in quenched samples is reflected in the temperature variation of the ca ratio and the electrical resistance below Tt; these variations can be interpreted in terms of variations in the octahedral-site Cu2+ concentration and the associated splitting of the Fe3+B and Cu+B energies." @default.
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- W2050584081 date "1989-04-01" @default.
- W2050584081 modified "2023-09-23" @default.
- W2050584081 title "Copper ferrite revisited" @default.
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- W2050584081 doi "https://doi.org/10.1016/0022-4596(89)90272-7" @default.
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