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The high-pressure manganese borate α-MnB 2 O 4  was synthesized under high-pressure/hightemperature conditions of 6.5 GPa and 1100  ◦ C in a modified Walker-type multianvil apparatus. The monoclinic compound is isotypic to α-FeB 2 O 4 , CaAl 2 O 4 -II, CaGa2O4, andβ -SrGa 2 O 4  crystallizing with eight formula units in the space group P2 1/c  (Z = 8) with the lattice parameters a = 712.1(2), b = 747.1(2), c = 878.8(2) pm, β = 94.1(1)◦, V = 0.466(1) nm 3 , R1 = 0.0326, and wR2 = 0.0652 (all data). The compound is built up from layers of “sechser” rings of corner-sharing BO 4  tetrahedra that are interconnected to a three-dimensional network. The manganese ions are coordinated by seven oxygen atoms and situated in channels along the a axis.

Synthesis and Characterization of the Manganese Borate α-MnB 2 O 4