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Abstract Details

Thermodynamics of CeSiO₄

Strzelecki A, Kreigsman K, Bourgeois C, Estevenon P, Goncharov V, Wei N, Szenknect S, Mesbah A, Wu D, Ewing R, Dacheux N & Guo X

Strzelecki A, Kreigsman K, Bourgeois C, Estevenon P, Goncharov V, Wei N, Szenknect S, Mesbah A, Wu D, Ewing R, Dacheux N & Guo X (2020) Goldschmidt Abstracts, 2020 2474

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08b: Room 3, View in program

Andrew Strzelecki View all 3 abstracts at Goldschmidt2020
Kyle Kreigsman
Clement Bourgeois
Paul Estevenon
Vitaliy Goncharov
Nian Wei
Stephanie Szenknect View all 2 abstracts at Goldschmidt2020
Adel Mesbah View all 2 abstracts at Goldschmidt2020
Di Wu View all 2 abstracts at Goldschmidt2020
Rodney Ewing View all 3 abstracts at Goldschmidt2020
Nicholas Dacheux View all 2 abstracts at Goldschmidt2020
Xiaofeng Guo View all 3 abstracts at Goldschmidt2020

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Carlos Jove Colon on
Nice work!!! The similarity of the DH_f(elem) values for CeSiO4 and USiO4 (coffinite) are in good agreement within uncertainty. Coffinite is not that rare in nature based on its occurrence in U ore localities. Any comments on a potential scenario for PuSiO4 to be "stable" in a deep geological repository?
Thank you Dr. Colon. I think that it is possible for PuSiO4 to be "stable" in a deep geological repository as is. However, I do think that PuSiO4 could form as a potential alteration phase in the unlikely failure of the system and breaching of the canister. The scenario that I see this occurring is if a pyrochlore waste form is utilized in a host rock lithology with significant amounts of halite (similar to WIPP) we would have a Pu(III) solid, such as Pu2Ti2O7, reacting with chloride rich hydrothermal solutions oxidizing the Pu(III) to Pu(IV) and forming PuSiO4 with any available silica. This is similar to how Estevenon et al. was able to synthesis PuSiO4 in their 2020 paper from a Pu(III) precursor reacting with HCl reactive media.

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