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This study is focused on the spinel structure of metal oxides and sulfides, from which the ternary (NiCo ₂ O ₄ /NiCo ₂ S ₄ ) and quaternary (Fe 0.5 Ni 0.5 Co ₂ O ₄ /Fe 0.5 Ni 0.5 Co ₂ S ₄ ) samples with hollow sphere structures were prepared.
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Lv et al. (2016) studied this question.
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