Abstract
Quadruple perovskites Ba 4 LnRu 3O 12 ( Ln=La, Nd, Sm–Gd, Dy–Lu) were prepared and their magnetic properties were investigated. They adopt the 12L-perovskite-type structure consisting of Ru 3O 12 trimers and LnO 6 octahedra. All of these compounds show an antiferromagnetic transition at 2.5–30 K. For Ba 4NdRu 3O 12, ferrimagnetic ordering has been observed at 11.5 K. The observed magnetic transition is due to the magnetic behavior of the Ru 4.33+ 3O 12 trimer with S= 1 2 . Magnetic properties of Ba 4 LnRu 3O 12 were compared with those of triple perovskites Ba 3 LnRu 2O 9 and double perovskites Ba 2 LnRuO 6.
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