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At high temperatures Sr 2 MnO 4-y  crystallizes in the K 2 NiF 4  structure with anion defects. X -ray structure determination in space group I 4/m m m (No. 139) with a = 380.58(3), c = 1253.19(11) pm reveals the composition Sr 2 MnO 3.84±0.05  for a single crystal prepared under argon at 1510 °C. The oxygen deficiency is restricted to the basal oxygen atoms in the perovskite layer. The X -ray experiment shows a statistical distribution of the defects. They lead to a distorted tetragonal pyramidal coordination of the Mn 3+  ions.

Untersuchungen zur Anionendefektverteilung in Sr 2 MnO 4-y / Investigation on the Distribution of Anion Vacancies in Sr 2 MnO 4-y