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Updated: Jan 11, 2026

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
Published on: October 27, 2018
New hydrated phases of potassium orthovanadate: K3(VO4)(H2O)0.56 and K3(VO4)(H2O)4
Tobias Wolflehner1, Matthias Weil1
1Institute for Chemical Technologies and Analytics, Division of Applied Solid State Chemistry, Getreidemarkt 9/E164-05-1, 1060 Vienna, Austria.
Abstract:
Single crystals of the hydrated potassium orthovanadate phases K3(VO4)·0.56H2O, tripotassium orthovanadate 0.56-hydrate, and K3(VO4)·4H2O, tripotassium orthovanadate tetra-hydrate, were isolated during the processing of products obtained under hydro-flux conditions. The asymmetric unit of K3(VO4)(H2O)0.56 (space group P1, Z = 12) comprises six formula units of K3(VO4) and five water mol-ecules of crystallization. The complex crystal structure is made up of isolated [VO4]3- tetra-hedra connected via K+ cations exhibiting coordination numbers between 6 and 8. The structure is consolidated by the formation of a finite hydrogen-bonded network between the water mol-ecules and [VO4]3- tetra-hedra. Two of the K+ cations are positionally disordered, and three of the water mol-ecules of crystallization are occupationally and/or positionally disordered. The asymmetric unit of K3(VO4)(H2O)4 (space group Pmn21, Z = 2) comprises two K+ cations, one VV atom, three O atoms and two water mol-ecules. The crystal structure is also made up from isolated [VO4]3- tetra-hedra inter-linked by K+ cations (coordination numbers 7 and 8). In comparison with the less-hydrated phase, the higher water content of this compound results in an infinite network of O-H⋯O hydrogen bonds between the water mol-ecules and [VO4]3- tetra-hedra.
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