Dissociation Energy of TiO(g) and the High-Temperature Vaporization and Thermodynamics of the Titanium Oxides. II. Trititanium Pentoxide
1967; American Institute of Physics; Volume: 46; Issue: 7 Linguagem: Inglês
10.1063/1.1841071
ISSN1520-9032
AutoresP. G. Wahlbeck, Paul W. Gilles,
Tópico(s)Energetic Materials and Combustion
ResumoVapor-pressure and mass-spectrometric measurements on Ti3O5(s) contained in tungsten crucibles show that for the congruent vaporization, Ti3O5(s)=3 TiO(g)+2 O(g),logK=−(1.504±0.011)×(105/T)+39.99±0.59.The vapor-pressure measurements were obtained in the temperature range 1837°—2040°K and are used with auxiliary values to obtain ΔH298° = 713.85±5.25 from the second-law treatment, ΔH298° = 717.42±3.10 kcal/mole from the third-law treatment, ΔS298° = 212.16±2.71 (second-law), and ΔS298° = 213.98 eu (third-law). Derived values based on the third-law result and on numerous auxiliary values are: D0∘(TiO)=167.38±2.30 kcal/mole,7.26±0.10 eV,D0∘(TiO2)≦292.06 kcal/mole,12.67 eV.Earlier work and discrepancies are discussed, and suggestions are made for future efforts.
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