Ramdas, S. ; Patil, K. C. ; Rao, C. N. R. (1970) Thermodynamics and kinetics of oxidation of Pr2O3 and Tb2O3 to non-stoicheiometric oxides Journal of the Chemical Society - A: Inorganic, Physical, Theoretical . pp. 64-68. ISSN 0022-4944
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Official URL: http://pubs.rsc.org/en/content/articlelanding/1970...
Related URL: http://dx.doi.org/10.1039/J19700000064
Abstract
Isobaric gravimetric studies of PrOx and TbOx systems have shown the equilibrium existence of several non-stoicheiometric phases; the transformation temperatures found by differential thermal analysis agree well with the data from gravimetric studies. Oxidation reactions of Pr2O3 and Tb2O3 to non-stoicheiometric oxides generally show anomalously high entropy changes (ca.-25 e.u./mole of O2) compared with the value of ca.-44 e.u./mole of O2 generally found in oxidation of metals. The anomalous entropy changes are shown to arise from configurational factors. Cubic Pr2O3 with the defect structure is more readily oxidized than the hexagonal Pr2O3. Kinetic studies show that oxidation of Pr2O3 is a phase-boundary-controlled reaction.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Royal Society of Chemistry. |
| ID Code: | 44614 |
| Deposited On: | 22 Jun 2011 12:02 |
| Last Modified: | 22 Jun 2011 12:02 |
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