CRYSTAL-STRUCTURE OF POTASSIUM PENTAVANADATE

Potassium pentavanadate, K3V5O14, is trigonal, space group P31m, with a = 8.6901(5) and c = 5.0063(4) angstrom. The crystal structure has been refined with 359 three-dimensional intensity data to R = 0.056. The structure consists of layers of comer-linked square and trigonal pyramids, with all pyramid apices oriented in the same direction parallel to the c-axis, and interlayered with K+ ions. In the final structure model, 8% of the layers are oriented randomly in the opposite direction.