On immobilization of high-level waste in an Y–Al garnet-based cermet matrix in SHS conditions

Konovalov, E. E.; Lastov, A. I.; Nerozin, N.A.

doi:10.1016/j.nucet.2015.11.021

Cited by 4 publications

(1 citation statement)

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“…The study of such compounds is very important for the immobilization of actinide elements (which constitute a special group of long-term ecologically hazardous radionuclides) in order to isolate these ones from the biosphere for the long time required for the storage and disposal. For this purpose, the world's leading laboratories are currently studying ceramic materials based on natural minerals [1]: monazite [2,3], garnet [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], kosnarite [18][19][20][21], pyrochlore [10,[22][23][24][25], scheelite [26], etc. The garnet structure is one of the most promising matrices for the MA immobilization.…”

Section: Introductionmentioning

confidence: 99%

Study of the Hydrolytic Stability of Fine-Grained Ceramics Based on Y2.5Nd0.5Al5O12 Oxide with a Garnet Structure under Hydrothermal Conditions

et al. 2021

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The hydrolytic stability of ceramics based on Y2.5Nd0.5Al5O12 oxide with a garnet structure obtained by the spark plasma sintering (SPS) method has been studied. The tests were carried out in distilled water under hydrothermal conditions in an autoclave and, for comparison, in a static mode at room temperature. The mechanism of leaching of Y and Nd from the ceramics was investigated. It has been shown that at “low” temperatures (25 and 100 °C), the destruction of pores occured, and the intensity of the leaching process was limited by the diffusion of ions from the inner part of the sample to the surface. At “high” test temperatures (200 and 300 °C), intense destruction of the ceramic grain boundaries was observed. It was assumed that the accelerated leaching of neodymium is due to the formation of grain-boundary segregations of Nd3+ in sintered ceramics.

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