Corrosive and mechanical resistance of MgO ceramics under metallizing and mild chlorination of spent nuclear fuel in molten salts

Golosov, O.; Khvostov, Sergey; Glushkova, Natalia; Evseev, M. V.; Staritsyn, S.V.; Zaikov, Yu. P.; Ковров, В. А.; Никитина, Е. В.; Kholkina, A. S.; Казаковцева, Н. А.; Карфидов, Э. А.; Karagergy, R.P.

doi:10.1016/j.ceramint.2020.09.171

Cited by 6 publications

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“…It has been established [31] that the homogeneous magnesium doping of Gd 2 Zr 2 O 7 (solid-solution Gd 2-x Mg x Zr 2 O 7-x/2 ) can prevent the ion exchange of high-density ceramics with LiCl-xLi 2 O melts up to a Li 2 O concentration of 4 wt.%. Thus, a small concentration of magnesium is assumed to be able to protect the material from interaction with the melt [32]. For this article, materials based on Gd 2 Zr 2 O 7 were chosen as the objects of study.…”

Section: Introductionmentioning

confidence: 99%

Electrical Properties and Chemical Resistance of the Composites (1-x)Gd2Zr2O7·xMgO in Li-Containing Chloride Melts

et al. 2023

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Composites of (1-x)Gd2Zr2O7·xMgO were prepared by mixing gadolinium zirconate with freshly precipitated Mg(OH)2 followed by heat treatment at 1500 °C. Small concentrations of magnesium oxide dissolved in the complex oxide matrix of Gd2Zr2O7. This led to decrease in the lattice parameters of the matrix phase and a complex redistribution of Gd and Zr over the A and B sublattices. According to the impedance spectroscopy results of the studied samples, for (1-x)Gd2Zr2O7·xMgO (x = 0.05, 0.07, 0.10), the ionic conductivity was slightly higher than that for the undoped Gd2Zr2O7. The share of dominant ion transport did not change upon doping with magnesium oxide. The composites showed chemical resistance in a lithium halide (LiCl) melt and interacted with LiCl-xLi2O (x = 2 wt.%, 4 wt.%) melts at 650 °C with the formation of a Gd2O3 phase or a mixture of phases (Gd2O3, Li2ZrO3, ZrO2, LiGdO2, or LiGdCl2) on the ceramic surface, respectively.

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Section: Introductionmentioning

confidence: 99%