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The compounds (RE)23+Cr3+Sb5+O7 (RE=Y or a rare earth except Ce, Pm, Lu) with pyrochlore structure have asymptotic Curie temperatures between 4° and 16°K; Ho2CrSbO7 and Dy2CrSbO7 are ferromagnetic below Tc=10°K and Tc=16°K, respectively. The moments of the chromium and the rare-earth ions are oriented parallel in these latter two compounds. The positive Cr3+–Cr3+ interaction in the pyrochlore structure is compared to the interaction between chromium ions in other compounds.
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Bongers et al. (1967) studied this question.
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