Manganese Vanadate Chemistry in Hydrothermal BaF<sub>2</sub> Brines: Ba<sub>3</sub>Mn<sub>2</sub>(V<sub>2</sub>O<sub>7</sub>)<sub>2</sub>F<sub>2</sub> and Ba<sub>7</sub>Mn<sub>8</sub>O<sub>2</sub>(VO<sub>4</sub>)<sub>2</sub>F<sub>23</sub>
Liurukara D. Sanjeewa (2127151)Colin D. McMillen (1591528)Michael A. McGuire (1454908)Joseph W. Kolis (1591525)
Abstract
Manganese\nvanadate fluorides were synthesized using high-temperature hydrothermal\ntechniques with BaF<sub>2</sub> as a mineralizer. Ba<sub>3</sub>Mn<sub>2</sub>(V<sub>2</sub>O<sub>7</sub>)<sub>2</sub>F<sub>2</sub> crystallizes\nin space group <i>C</i>2/<i>c</i> and consists\nof dimers built from edge-sharing MnO<sub>4</sub>F<sub>2</sub> trigonal\nprisms with linking V<sub>2</sub>O<sub>7</sub> groups. Ba<sub>7</sub>Mn<sub>8</sub>O<sub>2</sub>(VO<sub>4</sub>)<sub>2</sub>F<sub>23</sub> crystallizes in space group <i>Cmmm</i>, with a manganese\noxyfluoride network built from edge- and corner-sharing Mn<sup>2+/3+</sup>(O,F)<sub>6</sub> octahedra. These octahedra form alternating Mn<sup>2+</sup> and Mn<sup>2+/3+</sup> layers separated by VO<sub>4</sub> tetrahedra. This latter compound exhibits a canted antiferromagnetic\norder below <i>T</i><sub>N</sub> = 25 K.
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