Abstract
Mössbauer studies are reported on a magnesium manganite series Mg x Mn 2.9− x Fe 0.1O 4 for 0.5 ⩽ x ⩽ 2.4. In the region x ⩽ 1.4 two quadrupole doublets are observed while for x ⩾ 1.8 only one doublet could be observed. Quadrupole splitting (QS) has been studied as a function of x and an unusually large QS for the outer doublet has been attributed to Jahn-Teller distortion whose onset has been located in the region 1.8 > x > 1.4; this is corroborated by X-ray diffraction studies. Probable cation distributions are proposed. Oxygen ion parameters are estimated for the compositions corresponding to x = 1 (tetragonal phase) and x = 2 (cubic phase) under point charge approximation for electric field gradient at Fe 3+ sites.
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