Thermal decomposition of lead titanyl oxalate tetrahydrate

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

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Abstract

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
Volume14
Issue number3
DOIs
Publication statusPublished - 1976

Keywords

  • IR-68350

Cite this

van de Velde, G.M.H. ; Oranje, P.J.D. / Thermal decomposition of lead titanyl oxalate tetrahydrate. In: Thermochimica acta. 1976 ; Vol. 14, No. 3. pp. 269-278.
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Thermal decomposition of lead titanyl oxalate tetrahydrate. / van de Velde, G.M.H.; Oranje, P.J.D.

In: Thermochimica acta, Vol. 14, No. 3, 1976, p. 269-278.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - Thermal decomposition of lead titanyl oxalate tetrahydrate

AU - van de Velde, G.M.H.

AU - Oranje, P.J.D.

PY - 1976

Y1 - 1976

N2 - 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.

AB - 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.

KW - IR-68350

U2 - 10.1016/0040-6031(76)85004-6

DO - 10.1016/0040-6031(76)85004-6

M3 - Article

VL - 14

SP - 269

EP - 278

JO - Thermochimica acta

JF - Thermochimica acta

SN - 0040-6031

IS - 3

ER -