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Synthesis of YBa2Cu3O7−δ with clean grain boundaries by a modified aerosol decomposition process

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Abstract

A modified aerosol decomposition method was developed for producing sintered YBa2Cu3O7−δ (1-2-3) pellets having sharp superconducting transition Tc’s at ∼90 K, fine grain sizes, and clean grain boundaries. This method used “precursor” powders, which were produced with an aerosol flow reactor at 550 °C, instead of in situ produced 1-2-3 powders commonly processed at 880–1000 °C. As determined by x-ray absorption and powder diffraction studies, the 1-2-3 powders produced by the modified route contain less cation disorders than the in situ produced powders. The disorder is speculated to be the cause of Tc-suppression and broadening. It cannot be removed unless high sintering temperatures were used (>950 °C), which resulted in large grains and impurities and cracks at grain boundaries.

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Authors and Affiliations

  1. Materials Science Division, Brookhaven National Laboratory, 11973-5000, Upton, New York, USA

    Yuan-Liang Wang, Z. Q. Tan, Yimei Zhu, A. R. Moodenbaugh & M. Suenaga

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  1. Yuan-Liang Wang
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  2. Z. Q. Tan
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  3. Yimei Zhu
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  4. A. R. Moodenbaugh
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  5. M. Suenaga
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Wang, YL., Tan, Z.Q., Zhu, Y. et al. Synthesis of YBa2Cu3O7−δ with clean grain boundaries by a modified aerosol decomposition process. Journal of Materials Research 7, 3175–3184 (1992). https://doi.org/10.1557/JMR.1992.3175

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  • DOI: https://doi.org/10.1557/JMR.1992.3175

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