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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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Thorium oxygen and hydrogen compounds and complexes

Nuclear Energy Agency

The only stable solid oxide of thorium is ThO2, although the metastable monoxide, probably containing impurities, can be obtained from the black residue formed when thorium metal is dissolved in aqueous HCl. Ackermann and Rauh [1973ACK/RAU3] found that when this material, which has the approximate composition ThO(Cl,OH)H, Katzin [1958KAT], is heated, a phase with a face centred cubic cell with a = (5.302 ?? 0.003) Å is first formed. On further heating, this disproportionates to, essentially, Th and ThO2, see Appendix A. 

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