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DOE OSTI · 2283648

Chemical durability of multicomponent lanthanide zirconate solid solutions

Bryce, Keith·Yang, Kun·Yao, Tiankai·Lian, Jie
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Abstract

Multicomponent zirconate solid solutions A 2 Zr 2 O 7 (A= (Sm,Yb), (Sm,Yb,Gd), (Sm,Yb,Gd,Er), and (Sm,Yb,Gd,Er,Dy)) were synthesized through spark plasma sintering and their chemical durability was investigated via semi-dynamic leaching tests in pH = 1 nitric acid at 90°C. Incongruent dissolution occurred for all samples with the preferential elemental release of zirconium in all A 2 Zr 2 O 7 except for high entropy (Sm,Yb,Gd,Er,Dy)Zr 2 O 7 which displays a congruent release of the A-site elements and Zr. A strong positive correlation was found between the lanthanide elemental release rates and the A-site cation size disorder, whereas a negative correlation was observed between the elemental release rates and mixing entropy.

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36 MATERIALS SCIENCEAqueous corrosionBonding environmentHigh entropy ceramicNuclear waste formZirconate

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Bryce, Keith, Yang, Kun, Yao, Tiankai, Lian, Jie. 2023-09-28. Chemical durability of multicomponent lanthanide zirconate solid solutions. https://doi.org/10.1016/j.ceramint.2023.09.263

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