Thermal decomposition of lead titanyl oxalate tetrahydrate

G.M.H. van de Velde, P.J.D. Oranje

Research output: Contribution to journalArticleAcademic

10 Citations (Scopus)
116 Downloads (Pure)


The thermal behaviour of PbTiO(C2O4)2·4H2O (PTO) has been investigated, employing TG, quantitative DTA, infrared spectroscopy and (high temperature) X-ray powder diffraction. The decomposition involves four main steps. The first is the dehydration of the tetrahydrate (30–180°C), followed by a small endothermic (270–310°C) and a large exothermic decomposition of the oxalate. The main (exothermic) oxalate decomposition (310–390°C) results in a stable oxide-carbonate PbTiO25.(CO3)0.5. In the last step a phase transition, release of CO2 and ordering of the crystalline cubic PbTiO3 lattice can be detected (460–530C). It can be argued that for thermodynamic reasons the presence of lead-oxo- carbonates in the oxide-carbonate intermediate is not possible. No differences could be found in thermal behaviour of two crystallographically different synthetic forms of PTO, of which one has an orthorhombic lattice.
Original languageUndefined
Pages (from-to)269-278
JournalThermochimica acta
Issue number3
Publication statusPublished - 1976


  • IR-68350

Cite this