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- W1997329103 abstract "The Mössbauer spectrum and X-ray diffraction of CuCr x Fe 2- x O 4 ( x =0.1–0.8) have been studied with special emphasis on the atomic distribution and Debye temperature. At room temperature, the crystal structures of CuCr x Fe 2- x O 4 are found to be cubic spinel for x =0.2–0.8 and tetragonal for x =0.1. The increasing intensity ratio of the tetrahedral (A) to octahedral (B) patterns at low temperatures, below 250 K, with increasing temperature is explained in terms of the large differences of the Debye temperatures between A- and B-sites, while the decreasing intensity ratio at high temperatures is due to atomic migrations of iron ions from A- to B-sites, which are found to increase drastically with increasing temperature and chromium concentration x . Even at 150 K, atomic migration starts near Cr-concentration x =0.2, and increases with increasing Cr-concentration x to such a degree that about 10% of the Fe 3+ ions at the tetrahedral sites migrate to the octahedral sites for x =0.6. While, with increasing temperature, the atomic migration increases drastically to about 50% of the Fe 3+ ions at A-sites for x =0.5 at 300 K." @default.
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- W1997329103 date "1997-10-01" @default.
- W1997329103 modified "2023-09-25" @default.
- W1997329103 title "Atomic Migration and Debye Temperatures in CuCr<sub>x</sub>Fe<sub>2-x</sub>O<sub>4</sub>" @default.
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- W1997329103 doi "https://doi.org/10.1143/jjap.36.6339" @default.
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