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The phases LaSr1−xNaxFeO4 (x=0.00, 0.05, 0.10, 0.15, 0.20) with K2NiF4-type structure have been synthesized by standard ceramic method. The Rietveld analysis of the powder XRD data assigns tetragonal structures to all the compositions with I4/mmm symmetry. The lattice constant a almost remains constant, while there is increase in c with increasing x due to Jahn–Teller effect. The anomaly for x=0.2...
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