Kinetics of the thermal desorption of atomic oxygen during transformationsBiO2-x -> beta-Bi2O3 -> alpha-Bi2O3

Authors
Romanov, AN Fattakhova, ZT Rufov, YN Shashkin, DP
Citation
An. Romanov et al., Kinetics of the thermal desorption of atomic oxygen during transformationsBiO2-x -> beta-Bi2O3 -> alpha-Bi2O3, KINET CATAL, 42(2), 2001, pp. 275-280
Citations number
11
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
KINETICS AND CATALYSIS
ISSN journal
00231584 → ACNP
Volume
42
Issue
2
Year of publication
2001
Pages
275 - 280
Database
ISI
SICI code
0023-1584(200103/04)42:2<275:KOTTDO>2.0.ZU;2-Y
Abstract
The thermal desorption of atomic oxygen during the transformations BiO2-x - -> beta -Bi2O3 --> alpha -Bi2O3 is shown to be due to the removal of overst oichiometric oxygen from the bulk of beta -Bi2O3 Oxygen formed at the first stage is desorbed in a molecular form. The maximum desorption rate of atom ic oxygen is found before the phase transformation beta -Bi2O3 --> alpha -B i2O3. The activation energy of the diffusion of excess oxygen in the beta - Bi2O3 lattice is approximate to 30 kcal/mol.