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Role of Ba2Cu3O5 for the formation of YBa2Cu4O8 in the presence of nitric acid

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Abstract

The formation mechanism of YBa2Cu4O8 in the presence of nitric acid was carefully studied by utilizing X-ray powder diffraction to monitor the reaction route. Contrary to the formation of YBa2Cu3O7-δ in which BaCuO2 was the dominant intermediate, an intermediate Ba2Cu3O5 was identified and its yield was proportional to the amount of the nitric acid present in the formation of YBa2Cu4O8. This seems to play an important role in determining the formation of the YBa2Cu4O8 phase. To confirm the existence of this intermediate, Ba2Cu3O5 was prepared from the same condition directly. Also, the structure similarity between Ba2Cu3O5 and BaCuO2 was discussed and emphasized.

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  1. Materials Research Laboratories, Industrial Technology Research Institute, Chutung, 31015, Hsinchu, Taiwan

    Weir -Mirn Hurng & Sheng Feng Wu

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  1. Weir -Mirn Hurng
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  2. Sheng Feng Wu
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Hurng, W.M., Wu, S.F. Role of Ba2Cu3O5 for the formation of YBa2Cu4O8 in the presence of nitric acid. J Mater Sci 27, 4333–4336 (1992). https://doi.org/10.1007/BF00541562

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  • DOI: https://doi.org/10.1007/BF00541562

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