Salt flux crystal growth of the titanyl arsenate NaTiO[AsO4]

Abstract  

The titanyl arsenate NaTiO[AsO₄] was synthesized in the form of colourless lath-shaped crystals from arsenic and titanium dioxide in a NaCl/KCl flux at 850 °C. NaTiO[AsO₄] crystallizes with the monoclinic low-temperature form LT-CaTiO[SiO₄], space group P2₁/c. The structure was refined from single crystal diffractometer data: a = 6.7170(9), b = 8.7707(12), c = 7.2447(10) ?, β = 114.77(1)°, wR2 = 0.0559, 789 F ² values, and 74 variables. NaTiO[AsO₄] is characterized by a topology common to a wide range of oxide structures of stoichiometry AMOXO₄. It consists of parallel chains of trans-corner-sharing TiO₆ octahedra, cross-linked by isolated AsO₄ tetrahedra.