Ammonium oxofluorotitanates

New insights into polymer mediated formation of anatase mesocrystals

“…Specifically, for NH4TiOF3 MCs the appearance of a signal at 720cm -1 corresponds to the combination of the lattice modes of Ti-O and Ti-F and a signal at 920 cm -1 is consistent with the stretching mode of Ti=O or the asymmetric Ti-O-Ti stretching. 14,32,33 Subsequent loss of NH4 + in conversion of NH4TiOF3 MCs into TiO2 MCs is also evidenced by a complete loss of modes at 3274, 3184 and 3075 cm -1 and a dramatic reduction in the N-H bending frequency at 1410 cm -1 . 34,35 The p-XRD data, enabled the estimation of nanocrystallite size by using the Scherrer equation giving crystalline dimensions of the ab plane of TiO2 of ca.…”

Fluoride Processing of Titanium-Containing Minerals

“…One can expect the formation of ammonium oxofluorotitanate (NH 4 ) 3 TiOF 5 at this stage at pH = 7-8 [26]. This compound is isostructural with iron fluoroelpasolite, their crystal structures were determined [27].…”

Anatase TiO2 mesocrystals with exposed (001) surface for enhanced photocatalytic decomposition capability toward gaseous styrene

“…2F and 3), bulky NH 4 TiOF 3 particles with an average size of ca. 400 nm are formed [34,35]. Based on the above results, it can be found that the products with different morphology (from spindle shape to bulk) and composition (from TiO 2 to NH 4 TiOF 3 ) can be easily adjusted by simply controlling the added amount of NH 4 F. With an apt added amount of NH 4 F (0.15 g in this study), squareshaped single-crystal-like anatase TiO 2 structures assembled by square-shaped nanocrystals with exposed {0 0 1} facets can be obtained.…”