Mössbauer spectroscopy in the system La0.8Sr0.2(Mn,Fe,Co)O3

A systematic study of room temperature 57 Fe-Mossbauer spectra has been undertaken in the quasi-ternary system La 0.8 Sr 0.2 (Mn,Fe,Co)O 3 . The spectra exhibit a wide variety from simple to complex line shapes due to varying magnetic and/or quadrupolar interactions. Most samples are non-magnetic and show a linear variation of isomer shift vs. formal oxidation state. Magnetism seems to depend on a critical amount of Fe 3+ –Fe 3+ interactions. A magnetic phase diagram of the system at room temperature is presented.