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Rukang, Li
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article
YCa₃(MnO)₃(BO₃)₄ : A manganese borate containing ferromagnetic chains on a kagome lattice
Abstract
A new borate compound YCa3(MnO)(3)(BO3)(4) derived from the mineral gaudefroyite was prepared. It adopts a hexagonal space group P6(3)/m with cell parameters of a=10.5726(5) Angstrom and c=5.8576(3) Angstrom. Structural studies by x-ray and neutron powder diffraction (NPD) revealed that it is composed of edge-sharing chains of MnO6 octahedra along c, the chains being interconnected by triangular BO3 groups to form a kagome lattice in the ab plane. Both magnetic measurements and low-temperature NPD showed that the Mn ions within a given MnO chain are ferromagnetically coupled and, below 7.5 K, the magnetic moments of the chains order to give a normal q=0 structure of the kagome lattice.