An electron diffraction and high-resolution electron microscopy study shows that oxygen vacancies in BaCoO2.94 lead to a threefold superstructure along the (11(2) over bar 0)(2H) direction, the ...hhh... hexagonal sequence characteristic of the 2H type being maintained. According to compositional and structural data, the most probable structural model should be formed by three AO(3) layers intergrowing with one AO(2.67) layer along the c-axis. In such oxygen-deficient layers, one of each six oxygen atoms in every oxygen row is removed, leading to the observed superstructure. (C) 1997 Academic Press. [References: 21]
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