Lead-rich phases in partially processed Ag/Bi-2223 composite conductors

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The occurrence, composition, and melting behavior of lead-rich phases detected during the thermal processing of Ag/Bi-2223 composite conductors have been investigated by a combination of transmission electron microscopy (TEM), energy dispersive analysis (EDS), x-ray diffraction, differential thermal analysis, and Raman spectroscopy. A (Bi,Pb)-Sr-Ca-Cu-O composition with {open_quotes}4112{close_quotes} metal atom stoichiometry and Pb{approx_equal}Bi was detected during TEM/EDS examinations of partially processed/quenched Ag/Bi-2223 composites. An as-synthesized oxide mix with this stoichiometry was found to melt at a temperature <700{degrees}C. The lead-rich {open_quotes}3221{close_quotes} phase was found to have a wide range of compositional stability in terms of Pb/Bi ratio and Bi + Pb stoichiometry. ... continued below

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10 p.

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Luo, J. S.; Merchant, N. & Maroni, V. A. February 1996.

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Description

The occurrence, composition, and melting behavior of lead-rich phases detected during the thermal processing of Ag/Bi-2223 composite conductors have been investigated by a combination of transmission electron microscopy (TEM), energy dispersive analysis (EDS), x-ray diffraction, differential thermal analysis, and Raman spectroscopy. A (Bi,Pb)-Sr-Ca-Cu-O composition with {open_quotes}4112{close_quotes} metal atom stoichiometry and Pb{approx_equal}Bi was detected during TEM/EDS examinations of partially processed/quenched Ag/Bi-2223 composites. An as-synthesized oxide mix with this stoichiometry was found to melt at a temperature <700{degrees}C. The lead-rich {open_quotes}3221{close_quotes} phase was found to have a wide range of compositional stability in terms of Pb/Bi ratio and Bi + Pb stoichiometry. Evidence was seen for the co-existence of this phase with (Ca,Sr){sub 2}PbO{sub 4} in partially processed Ag/Bi-2223 composites that were cooled slowly through the 800 to 600{degrees}C range.

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10 p.

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OSTI as DE96009126

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  • Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Anaheim, CA (United States), 4-8 Feb 1996

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  • Other: DE96009126
  • Report No.: ANL/CMT/CP--89594
  • Report No.: CONF-960202--23
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 226421
  • Archival Resource Key: ark:/67531/metadc671182

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  • February 1996

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 16, 2015, 12:53 p.m.

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Luo, J. S.; Merchant, N. & Maroni, V. A. Lead-rich phases in partially processed Ag/Bi-2223 composite conductors, article, February 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc671182/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.