Kinetics of the Thermal Desorption of Atomic Oxygen
during Transformations BiO_2x -Bi₂O₃ -Bi₂O₃

A. N. Romanov, Z. T. Fattakhova, Yu. N. Rufov, and D. P. Shashkin

Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 117977 Russia

Received January 18, 1999

Abstract—The thermal desorption of atomic oxygen during the transformations BiO_2x -Bi₂O₃ -Bi₂O₃
is shown to be due to the removal of overstoichiometric oxygen from the bulk of -Bi₂O₃. Oxygen formed at
the first stage is desorbed in a molecular form. The maximum desorption rate of atomic oxygen is found before
the phase transformation -Bi₂O₃ Bi₂O₃. The activation energy of the diffusion of excess oxygen in the
-Bi₂O₃ lattice is 30 kcal/mol.

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