Single-crystal x-ray diffraction and high-resolution electron microscopy studies were carried out for Co-121 ([Ca2CoO3] p CoO2) and Sr-doped Co-121 grown in a KCl flux at 810°C. Typically, the samples were 2 mm × 2 mm × 0.02 mm in size. The single-crystal diffraction intensities were measured by the use of a four-circle diffractometer. Twinned super reflections, e.g., \( 010\bar{1}/0\bar{2}04 \) and \( 020\bar{2}/0\bar{1}03 \) were observed in the electron diffraction patterns. These super reflections were not observed in the end-member. Diffuse scattering was observed in the same reciprocal space by the single-crystal x-ray diffraction study. A discommensurate crystal model is proposed for the Sr-doped system.
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Acknowledgements
The present study was partly supported by the Core Research for Evolution, Science, and Technology (CREST) Project of the Japan Science and Technology Agency (JST) and also by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, and Technology of Japan.
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Kajitani, T., Yubuta, K., Huang, X. et al. Discommensuration of Doped [Ca2CoO3] p CoO2 . J. Electron. Mater. 38, 1462–1467 (2009). https://doi.org/10.1007/s11664-009-0784-5
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DOI: https://doi.org/10.1007/s11664-009-0784-5