Manganese Vanadate Chemistry in Hydrothermal BaF2 Brines: Ba3Mn2(V2O7)2F2 and Ba7Mn8O2(VO4)2F23

Liurukara D Sanjeewa; Colin D McMillen; Michael A McGuire; Joseph W Kolis

doi:10.1021/acs.inorgchem.6b02355

Manganese Vanadate Chemistry in Hydrothermal BaF₂ Brines: Ba₃Mn₂(V₂O₇)₂F₂ and Ba₇Mn₈O₂(VO₄)₂F₂₃

Inorg Chem. 2016 Dec 19;55(24):12512-12515. doi: 10.1021/acs.inorgchem.6b02355. Epub 2016 Dec 5.

Authors

Liurukara D Sanjeewa¹, Colin D McMillen¹, Michael A McGuire², Joseph W Kolis¹

Affiliations

¹ Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University , Clemson, South Carolina 29634-0973, United States.
² Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.

PMID: 27989183
DOI: 10.1021/acs.inorgchem.6b02355

Abstract

Manganese vanadate fluorides were synthesized using high-temperature hydrothermal techniques with BaF₂ as a mineralizer. Ba₃Mn₂(V₂O₇)₂F₂ crystallizes in space group C2/c and consists of dimers built from edge-sharing MnO₄F₂ trigonal prisms with linking V₂O₇ groups. Ba₇Mn₈O₂(VO₄)₂F₂₃ crystallizes in space group Cmmm, with a manganese oxyfluoride network built from edge- and corner-sharing Mn^2+/3+(O,F)₆ octahedra. These octahedra form alternating Mn²⁺ and Mn^2+/3+ layers separated by VO₄ tetrahedra. This latter compound exhibits a canted antiferromagnetic order below T_N = 25 K.