Phase Composition and Hydrothermal Stability of Ceramics Based on Murataite.

Autor:	Yudintsev, S. V., Danilov, S. S., Vinokurov, S. E., Stefanovskaya, O. I., Nikonov, B. S., Nikol'sky, M. S., Skvortsov, M. V., Myasoedov, B. F.
Předmět:	RADIOACTIVE wastes CERAMICS PEROVSKITE HYDROTHERMAL deposits PYROCHLORE LEACHING
Zdroj:	Radiochemistry; 2020, Vol. 62 Issue 6, p744-751, 8p
Abstrakt:	The influence exerted by the composition of ceramics with imitators of radioactive wastes (Nd, U) on their stability against leaching in water at 90 and 150°C has been studied. Raising the content of TiO2 in a ceramic with Nd led to an increase in the fraction of perovskite and decrease in the amount of murataite. Samples with perovskite have the lowest stability in solution, especially at 150°C. Making smaller the fraction of perovskite lowers the rate of Nd leaching by a factor of 2 (90°C) and 5 (150°C). The weaker influence exerted by temperature on the U leaching from the samples is observed because more stable pyrochlore or zirconolite appear in the samples instead of perovskite. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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