Synthesis, crystal structure, and magnetic properties of the oxometallates KBaMnO4 and KBaAsO4

• KBaAsO4 and KBaMnO4 crystals were grown using the hydroflux method.
• Crystals of a rare Mn5+ oxide were obtained.
• The crystals were characterized by single crystal X-ray diffraction.
• The magnetic properties of the crystals were studied.

Single crystals of KBaMnO4 and KBaAsO4 were grown using the hydroflux method and characterized by single crystal X-ray diffraction. Both compounds crystallize in the orthorhombic space group Pnma with a = 7.7795(4) Å, b = 5.8263(3) Å, and c = 10.2851(5) Å for the manganate and a = 7.7773(10) Å, b = 5.8891(8) Å, and c = 10.3104(13) Å for the arsenate. The materials exhibit a three-dimensional crystal structure consisting of isolated MnO43− or AsO43− tetrahedra, with the charge balance maintained by K+ and Ba2+. Each tetrahedron is surrounded by six K+ and five Ba2+, and shares its corner/edge with KO10 polyhedra and corner/edge/face with BaO9 polyhedra, respectively. The crystal growth, crystal structure and magnetic properties are discussed.

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