Ruddlesden-Popper type phases La2SrFe2O7 and La2SrMn2O7 have been prepared by traditional ceramic method and their crystal structure has been determined by powder X-ray diffraction study. The iron compound has a tetragonal unit cell witha=3·916 Å andc=20·463 Å, while the phase containing manganese hasa=3·868 Å andc=20·205 Å in the space groupI4/mmm. La2SrMn2O7 is ferromagnetic in the temperature 77–300 K and exhibits spin state transition above 210K, while La2SrFe2O7 is antiferromagnetic. Both the phases are insulators and electrical conduction in La2SrMn2O7 is a function of transition in magnetic behaviour of the metal ion Mn3+, while insulator behaviour is more pronounced in La2SrFe2O7.
Volume 134, 2022
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