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Chemical Thermodynamics of Thorium

image of Chemical Thermodynamics of Thorium

This volume is the eleventh in the OECD Nuclear Energy Agency (NEA) “Chemical Thermodynamics” series. It is based on a critical review of the thermodynamic properties of thorium, its solid compounds and aqueous complexes, initiated as part of the NEA Thermochemical Database Project Phase III (TDB III). The database system developed at the OECD/NEA Data Bank ensures consistency not only within the recommended data sets of thorium, but also amongst all the data sets published in the series. This volume will be of particular interest to scientists carrying out performance assessments of deep geological disposal sites for radioactive waste.

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Appendix F

Comment on the data for ZrO(g) and ZrO2(g)

Nuclear Energy Agency

There may be some problems with the data for ZrO(g) and ZrO2(g) selected in the NEA-TDB review of zirconium by Brown et al. [2005BRO/CUR]. The values given by Brown et al. are based on the assessment in the third edition of the Janaf tables [1985CHA/DAV], modified for the slightly different values of ?? f m ?? H (ZrO2, cr, 298.15 K) used in the two reviews. However, the assessments in [1985CHA/DAV] for these species were made in December 1965 and thus predate a number of detailed experimental studies made in 1970s. Indeed, their values of the Gibbs energies of formation of both ZrO(g) and ZrO2(g) are based solely on an early mass-spectrometric study by Chupka et al. [1957CHU/BER].

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