Abstract
Abstract A mixed transition metal borate Co5–x VxCoy[B12O26–z (OH) z ] was synthesized in a Walker-type module using the high-pressure/high-temperature approach at 12 GPa and 1,300 °C. The product crystallizes in the space group I41/acd. It is isotypic to other 3d metal cation borates of the M 5[B12O25(OH)]–M 5 M[B12O22(OH)4] solid solution series. The title compound features three different metal cation positions; one octahedral site contains a mixture of V and Co, another octahedral site is fully occupied with Co, and a cuboctahedral position that is partially occupied with Co. It is the first compound within this structure type to contain Co, increasing the range of elements that can be incorporated and thus illustrating the adaptability and structural diversity of this anionic borate network.
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