Print Email Facebook Twitter Structural and thermodynamic study of Cs3Na(MoO4)2 Title Structural and thermodynamic study of Cs3Na(MoO4)2: Margin to the safe operation of sodium cooled fast reactors Author Smith, A.L. (TU Delft RST/Reactor Physics and Nuclear Materials) Kauric, G.P.T.F. (PSL Research University) van Eijck, L. (TU Delft RST/Neutron and Positron Methods in Materials) Goubitz, K. (TU Delft RST/Technici Pool) Clavier, N. (Université de Montpellier) Wallez, G. (UPMC-Sorbonne Universités & CNRS) Konings, R. (European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe) Date 2019 Abstract Neutron diffraction measurements of the double molybdate Cs3Na(MoO4)2 have been performed for the first time in this work and the crystal structure refined using the Rietveld method. The thermal expansion of this trigonal phase, in space group P3¯m1, measured using high temperature X-ray diffraction (XRD), remains moderate: αa=31·10−6K−1 and αc=24·10−6K−1 in the temperature range T = (298−723) K. The melting temperature of this compound has been determined at Tfus= (777 ± 5) K using Differential Scanning Calorimetry (DSC). No phase transition was detected, neither by DSC, nor by high temperature XRD or high temperature Raman spectroscopy, which disagrees with the literature data of Zolotova et al. (2016), who reported a reversible phase transition around 663 K. Finally, thermodynamic equilibrium calculations have been performed to assess the probability of formation of Cs3Na(MoO4)2 inside the fuel pin of a Sodium cooled Fast Reactor by reaction between the cesium molybdate phase Cs2MoO4, which forms at the pellet rim at high burnup, the fission product molybdenum (either as metallic or oxide phase), and the liquid sodium coolant in the accidental event of a breach of the stainless steel cladding and sodium ingress in the failed pin. Subject Differential scanning calorimetryDouble molybdatesNeutron diffractionRaman spectroscopyX-ray diffraction To reference this document use: http://resolver.tudelft.nl/uuid:3d3d01f1-9b88-4cfd-a579-37bfef4e2858 DOI https://doi.org/10.1016/j.jssc.2018.08.033 Embargo date 2020-09-11 ISSN 0022-4596 Source Journal of Solid State Chemistry, 269, 1-8 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2019 A.L. Smith, G.P.T.F. Kauric, L. van Eijck, K. Goubitz, N. Clavier, G. Wallez, R. Konings Files PDF manuscript_Cs3Na_MoO4_2_s ... ucture.pdf 1.3 MB Close viewer /islandora/object/uuid:3d3d01f1-9b88-4cfd-a579-37bfef4e2858/datastream/OBJ/view