Effect of particle size of titanium oxide β-Ti3O5 on its thermal stability

It was established that the particle size of titanium oxide β-Ti₃O₅ has a great influence on the processes of phase formation and the stability of particles during heating. It was shown that at a temperature of about 456 K, β-Ti₃O₅ micro crystals undergo a reversible first-order phase transition, in which the low- temperature β-Ti₃O₅ phase is transformed into the high-temperature λ- Ti₃O₅ phase, and at higher temperatures the β-Ti₃O₅ phase is partially oxidized to form the Magnéli phase Ti₄O₇. It was found that β-Ti₃O₅ nanocrystals are unstable in an argon atmosphere and at temperatures above 400 K the β-Ti₃O₅ powder is oxidized.