Abstract
K2NiF4 type compounds Sm2–xSrxNiO4+δ(0.4≤x≤1.2) have been synthesized by a citric acid complex decomposition method. Rietveld refinement of the powder X-ray diffraction data showed that there was a crystal system transformation from orthorhombic Fmmm to tetragonal I4/mmm at around x=0.6. The Sr substitution caused a drastic shift of the OII ions along the c axis from Sm(Sr) towards Ni whilst scarcely affecting the NiO4 network in the basal plane. The distortion of the NiO6 octahedron decreased, while the average bond valence of Ni increased with increasing x.
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