Two new alkali vanadate carbonates with divalent transition metals have been synthesized as large single crystals via a high-temperature (600 °C) hydrothermal technique. Compound I , Rb 2 Mn 3 (VO 4 ) 2 CO 3 , crystallizes in the trigonal crystal system in the space group P 3̄1 c , and compound II , K 2 Co 3 (VO 4 ) 2 CO 3 , crystallizes in the hexagonal space group P 6 3 / m . Both structures contain honeycomb layers and triangular lattices made from edge-sharing MO 6 octahedra and MO 5 trigonal bipyramids, respectively. The honeycombmore »
Sodium Transition Metal Vanadates from Hydrothermal Brines: Synthesis and Characterization of NaMn 4 (VO 4 ) 3 , Na 2 Mn 3 (VO 4 ) 3 , and Na 2 Co 3 (VO 4 ) 2 (OH) 2