Monitoring the microstructural evolution of Nd2Zr2O7 pyrochlore during dissolution at 90 °C in 4 M HCl: Implications regarding the evaluation of the chemical durability

The chemical durability of Nd2Zr2O7 ceramic is investigated using complementary surface analysis techniques.

(Equipe lime)

Understanding the dissolution mechanism at the solid/solution interface of Nd2Zr2O7 pyrochlore is a critical step to evaluate its suitability to immobilize radionuclides. In this aim, the chemical durability of Nd2Zr2O7 pyrochlore sintered samples in 4 M HCl was examined by several complementary techniques (ESEM, XRR, AFM, GIXRD). Microstructural and structural changes were evidenced at the solid/solution interface.

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Szenknect S., Finkeldei S., Brandt F., Ravaux J., Odorico M., Podor R., Lautru J., Dacheux N. and Bosbach D. J. Nucl. Mat.. 496, 97 (2017)