Journal
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
Volume 52, Issue 12, Pages 1822-1829Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0036023607120030
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Differential thermal analysis (DTA) and thermogravimetric analysis (TGA) of an alpha-Bi2O3 sample revealed staged phase transitions in the range 720-800 degrees C ( at 720, 780, and 800 degrees C) and the elimination of oxygen to the composition Bi2O2.967 during heating to 895 degrees C in air at 16 K/min. In dynamic vacuum ( p = 1.33 Pa) at 780-800 degrees C, Bi2O3 consecutively transforms to a phase with the cubic gamma-Bi2O3 structure and tetragonal Bi2O2.3-2.4. In the latter, electron diffraction in a transmission electron microscope (ED/TEM) shows a superstructure with the superstructure vector q(110)approximate to 1/9, which indicates an ordered arrangement of oxygen vacancies.
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