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Ba4NbMn3O12 is reported, synthesized by a solid state method in air. Thecrystal structure, determined by performing refinements on room temperaturepowder X-ray diffraction data by the Rietveld method, consists of Mn3O12trimers in the configuration of three face-sharing MnO6 octahedra, with thetrimers arranged in triangular planes. An effective moment of 4.82 {\mu}B/f.uis observed and competing antiferromagnetic and ferromagnetic interactionsbetween Mn ions are inferred from the Weiss temperature of -4 K and theferrimagnetic ordering transition of approximately 42 K. Ba4NbMn3O12 is asemiconductor with a transport activation energy of 0.37 eV.

Trimers of MnO6 octahedra and ferrimagnetism of Ba4NbMn3O12