Journal of Materials Science

, Volume 27, Issue 16, pp 4333–4336 | Cite as

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

  • Weir -Mirn Hurng
  • Sheng Feng Wu


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.


Polymer Nitric Acid Powder Diffraction Formation Mechanism Reaction Route 
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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • Weir -Mirn Hurng
    • 1
  • Sheng Feng Wu
    • 1
  1. 1.Materials Research LaboratoriesIndustrial Technology Research InstituteHsinchuTaiwan

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