| Summary: | This work is devoted to the study of phase transition processes in nanostructured ceramics of the Y<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub>-Y<sub>2</sub>TiO<sub>5</sub> type doped with carbon nanotubes as a result of thermal annealing, as well as to the assessment of the prospects of the effect of phase composition on photocatalytic activity. By the method of X-ray phase analysis, it was found that an increase in the annealing temperature leads to the formation of the orthorhombic phase Y<sub>2</sub>TiO<sub>5</sub>, as well as structural ordering. Based on the obtained UV spectra, the band gap was calculated, which varies from 2.9 eV (initial sample) to 2.1 eV (annealed at a temperature of 1000 °C). During photocatalytic tests, it was established that the synthesized nanostructured ceramics Y<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub>-Y<sub>2</sub>TiO<sub>5</sub> doped CNTs show a fairly good photocatalytic activity in the range of 60–90% decomposition of methyl orange.
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