We have synthesized samples of the misfit-layered [CoCa 2 O 3 ] q CoO 2 compound with three different oxygen contents and characterized them by both wet-chemical and thermogravimetric analyses for the determination of precise oxygen content, and by synchrotron X-ray diffraction for the precise determination of the magnitude of q . Combining the results from the structural and oxygen-content analyses it is concluded that for samples synthesized in air or a more reducing atmosphere there occur considerable amounts of oxygen vacancies in at least one of the three types of layers, CoO, CaO, and CoO 2 . Bulk character of the oxygen vacancies was confirmed from transport-property measurements.
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Karppinen et al. (2004) studied this question.
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