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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 Group 16 compounds and complexes

Nuclear Energy Agency

Zachariasen [1949ZAC], [1949ZAC3] unambiguously identified four phases in the range S/Th = 0.8??????2.0 and elucidated their structures. From powder data, ThS(cr) is reported as cubic (NaCl type, Fm3m ), with a = (5.682??????0.002) Å and isomorphous with CeS and US, while ThS2(cr) is orthorhombic (PbCl2 type, Pnmb– 16 2h D ), with a??=??(4.267??????0.002), b = (7.264??????0.003), and c = (8.617??????0.003) Å. Using single crystal data, Zachariasen also reported Th2S3(cr) as orthorhombic (Sb2S3 type, Pbnm) with a??=??(10.99??????0.05), b = (10.85??????0.05), and c = (3.96??????0.03) Å, isomorphous with U2S3, and Th7S12(cr) hexagonal (P63/m), with a = (11.063??????0.001) and c = (3.991??????0.001) Å. It was also noted, at the time, that the homogeneity range for that phase extends from S/Th??= 1.71 to 1.76. 

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