| Summary: | The interest in lithium-containing ceramics is due to their huge potential as blanket materials for thermonuclear reactors for the accumulation of tritium. However, an important factor in their use is the preservation of the stability of their strength and structural properties when under the influence of external factors that determine the time frame of their operation. This paper presents the results of a study that investigated the influence of the LiTiO<sub>2</sub> phase on the increasing resistance to degradation and corrosion of Li<sub>2</sub>TiO<sub>3</sub> ceramic when exposed to aggressive acidic media. Using the X-ray diffraction method, it was found that an increase in the concentration of LiClO<sub>4</sub>·3H<sub>2</sub>O during synthesis leads to the formation of a cubic LiTiO<sub>2</sub> phase in the structure as a result of thermal sintering of the samples. During corrosion tests, it was found that the presence of the LiTiO<sub>2</sub> phase leads to a decrease in the degradation rate in acidic media by 20–70%, depending on the concentration of the phase. At the same time, and in contrast to the samples of Li<sub>2</sub>TiO<sub>3</sub> ceramics, for which the mechanisms of degradation during a long stay in aggressive media are accompanied by large mass losses, for the samples containing the LiTiO<sub>2</sub> phase, the main degradation mechanism is pitting corrosion with the formation of pitting inclusions.
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