3 years ago

A novel representative in the rare family of trivanadates, KMn2V3O10: synthesis, crystal structure and magnetic properties

A novel representative in the rare family of trivanadates, KMn2V3O10: synthesis, crystal structure and magnetic properties
Olga Volkova, Zlata Pchelkina, Alexander Vasiliev, Anatoliy Volkov, Olga Yakubovich, Larisa Shvanskaya, Olga Dimitrova
Potassium dimanganese trivanadate, KMn2V3O10, is synthesized hydrothermally and its crystal structure is determined from single-crystal X-ray data. The novel phase crystallizes with triclinic symmetry in space group with unit-cell parameters of a = 6.912 (5) Å, b = 6.993 (5) Å, c = 9.656 (5) Å, α = 101.858 (5), β = 102.627 (5), γ = 100.663 (5)°, Z = 2 and V = 432.6 (5) Å3. Its structure is built from tetramers of MnO6 octahedra sharing edges and trimers of VO4 tetrahedra sharing vertices. These main structural fragments are linked in a three-dimensional framework with channels occupied by potassium ions. The transformation of this structure to that of interconnected NaCa3Mn(V3O10)(V2O7) is discussed. The title compound orders antiferromagnetically at TN = 8.2 K due to the magnetic exchange interactions between tetramers of Mn octahedra through VO4 tetrahedra. First-principles calculations showed the magnetic couplings via Mn—O—Mn and Mn—O—V—O—Mn pathways.In the crystal structure of KMn2V3O10, tetramers of MnO6 octahedra sharing edges and trimers of VO4 tetrahedra sharing vertices are linked in a three-dimensional framework with channels occupied by K3+ ions. The novel representative in the rare family of trivanadates orders antiferromagnetically at TN = 8.2 K.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1107/S205252061701811X

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