Experimental investigations and thermodynamic modelling of the ternary system Pb-Mo-O

Journal article (2024)

Authors

A. van Hattem RST/Reactor Physics and Nuclear Materials - AS
B.J.R. Dankelman RID/TS/Technici Pool
Eric Colineau European Commission Joint Research Centre
Jean Christophe Griveau European Commission Joint Research Centre
Kathy Dardenne Karlsruhe Institut für Technologie
Jörg Rothe Karlsruhe Institut für Technologie
S.D. Couweleers RST/Technici Pool - AS
R. Konings RST/Reactor Physics and Nuclear Materials - AS
A.L. Smith RST/Reactor Physics and Nuclear Materials - AS
Research Group
RST/Reactor Physics and Nuclear Materials (AS) (TU Delft)
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Published Date

2024

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Reactor Physics and Nuclear Materials

Abstract

A combined experimental and modelling study into the Pb-Mo-O system has been conducted in view of the safety analysis for lead-cooled nuclear systems. The thermal expansion and low-temperature heat capacity of the ternary compounds PbMoO4 and Pb2MoO5 have been determined experimentally, as well as the melting enthalpy of PbMoO4. Moreover, XANES measurements have confirmed the hexavalent oxidation state of Mo in PbMoO4 and Pb2MoO5.

A thermodynamic model of the ternary system including the ternary phases PbMoO4, Pb2MoO5 and Pb5MoO8 has also been developed in this work based on the CALPHAD methodology. For the first time, an ionic two-sublattice model is used for the liquid phase, while the compound energy formalism is used for the solid phases.