Thermal behavior of layered α-titanium phosphates: from the titanium(IV) bis(hydrogenphosphate) monohydrate to an europium(III)-phase via propylamine intercalation

Abstract

Polycrystalline layered α-titanum phosphate, α-Ti(HPO 4) 2 •H 2 O, has been obtained under H 3 PO 4 (aq) reflux conditions, and its intercalation compound with propylamine, α-Ti(HPO 4) 2 •2C 3 H 7 NH 2 •H 2 O, was used for trapping luminescent Eu-centers in two-dimensional confined space. All materials were characterized by X-ray powder diffraction (XPD), scanning electron microscopy (SEM), solid-state nuclear magnetic resonance (SS-NMR, 31 P MAS and 13 C CPMAS) and thermogravimetric analysis coupled with mass spectrometry (TG-MS). Moreover, the activation energy of thermal decomposition has been calculated as a function of the extent of conversion, applying both a modified Friedman method developed in our Lab and the advanced nonlinear method proposed by Vyazovkin.