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The compounds Co 5 Sn(BO 3 ) 2 O 4  (I) and Co 5 Mn(BO 3 ) 2 O 4  (II) were prepared by using a B 2 O 3  flux technique. Single crystals were investigated by X-ray diffraction and showed orthorhombic symmetry, space group D 2h  9 -Pbam (No. 55), I a = 944.4; b = 1233.8; c = 310.5 pm; Z = 2 and II a = 925.07; b = 1241.67; c = 305.24 pm; Z = 2. Both compounds are isotypic to the mineral Ludwigite. All metal point positions show an octahedral oxygen coordination. Co 2+  and M 4+  (M = Sn or Mn) occupy one point position statistically. Both structures contain isolated, trigonal planar BO 3  units and oxygen atoms that are not coordinated to boron.

zeitschrift für naturforschung b

Synthese und röntgenographische Charakterisierung von zwei neuen Verbindungen des Ludwigit-Strukturtyps: Co 5 Sn(BO 3 ) 2 O 4  und Co 5 Mn(BO 3  ) 2 O 4 /Synthesis and X -Ray Characterization of Two New Compounds with Ludwigite-Structure: Co 5 Sn(BO 3 ) 2 O 4  and Co 5 Mn(BO 3 ) 2 O 4