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- W2164950385 abstract "K2NiF4 type compounds Sm2-xSrxCuO4(0 ≤ x ≤ 1.2) were prepared. Rietveld refinement of powder diffraction data snows that the crystal system of these compounds belongs to T type tetragonal structure of space group I4/mmm, and the addition of Sr causes a dramatic shift of the O(I) ions along the c axis from Sm (Sr) toward Cu while scarcely affecting the Cu—O (II) bond in basal CuO4 plane. From XRD data, it can be seen that when 0.0 ≤ x ≤ 0.6, Sm2-xSrxCuO4 belongs to a single-phase K2NiF4 type structure, while at x ⩾ 0.7, both the free SrO phase and the CuO phase exist in these compounds. From the results of XPS and Rietveld refinement, it can be seen that after replacing Sm3+ with Sr2+ of lower valence, the valence of Cu and Sm does not change apparently, and thus some defect must be formed at the oxygen ion positions and/or position A on A2BO4 to keep charge balance and to stabilize the structure." @default.
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- W2164950385 date "2010-08-26" @default.
- W2164950385 modified "2023-09-25" @default.
- W2164950385 title "Synthesis, Crystal Structure and Reducibility of K2NiF4 Type Oxides Sm2-xSrxCuO4" @default.
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- W2164950385 doi "https://doi.org/10.1002/cjoc.20020200410" @default.
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