Structural Studies and Thermal Analysis in the Cs2MoO4-PbMoO4 System with Elucidation of β-Cs2Pb(MoO4)2

Journal article (2023)

Authors

A. van Hattem RST/Reactor Physics and Nuclear Materials - AS
J. Vlieland RST/Technici Pool - AS
B.J.R. Dankelman RID/TS/Technici Pool
M.A. Thijs RID/TS/Technici Pool
Gilles Wallez Universite Pierre et Marie Curie (UPMC)
Kathy Dardenne Karlsruhe Institut für Technologie
Jörg Rothe Karlsruhe Institut für Technologie
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)
Copyright: © 2023 A. van Hattem, J. Vlieland, B.J.R. Dankelman, M.A. Thijs, Gilles Wallez, Kathy Dardenne, Jörg Rothe, R. Konings, A.L. Smith
DOI: https://doi.org/10.1021/acs.inorgchem.3c00241
More Info
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Published Date

2023

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Reactor Physics and Nuclear Materials

Abstract

The quaternary compound Cs2Pb(MoO4)2 was synthesized and its structure was characterized using X-ray and neutron diffraction from 298 to 773 K, while thermal expansion was studied from 298 to 723 K. The crystal structure of the high-temperature phase β-Cs2Pb(MoO4)2 was elucidated, and it was found to crystallize in the space group R3̅m (No. 166), i.e., with a palmierite structure. In addition, the oxidation state of Mo in the low-temperature phase α-Cs2Pb(MoO4)2 was studied using X-ray absorption near-edge structure spectroscopy. Phase diagram equilibrium measurements in the Cs2MoO4-PbMoO4 system were performed, revisiting a previously reported phase diagram. The equilibrium phase diagram proposed here includes a different composition of the intermediate compound in this system. The obtained data can serve as relevant information for thermodynamic modeling in view of the safety assessment of next-generation lead-cooled fast reactors.