Two-stage sintering of dense superconducting YBa2Cu4O8 ceramics

Motohide Matsuda, Yoshihisa Ogawa, Kimihiro Yamashita, Takao Umegaki, Michihiro Miyake

Research output: Contribution to journalArticle

Abstract

Dense YBa2Cu4O8 (124) ceramics were prepared by the following two-stage sintering: compressed 124 powders were heated to 1203 K for decomposition to YBa2Cu3O7-x (123) and CuO, and then cooled down to 1073 K and annealed for the re-formation of 124 single phase. The relative densities thus obtained were 93-95%, as high as those prepared under high oxygen pressure. The densification was considered to take place due to the liquid phase. In the sintered 124, the island-like fine grains of CuO were observed within the 123 matrix. As a result, it was considered that the re-formation of 124 proceeded in each grain. The geometrical phase distribution in the grains is discussed on the basis of superconducting properties from resistivity measurements.

Original languageEnglish
Pages (from-to)1205-1209
Number of pages5
JournalJournal of Materials Research
Volume12
Issue number5
Publication statusPublished - May 1997

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sintering
Sintering
ceramics
high pressure oxygen
densification
Densification
Powders
liquid phases
Oxygen
Decomposition
decomposition
electrical resistivity
Liquids
matrices
barium copper yttrium oxide

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Matsuda, M., Ogawa, Y., Yamashita, K., Umegaki, T., & Miyake, M. (1997). Two-stage sintering of dense superconducting YBa2Cu4O8 ceramics. Journal of Materials Research, 12(5), 1205-1209.

Two-stage sintering of dense superconducting YBa2Cu4O8 ceramics. / Matsuda, Motohide; Ogawa, Yoshihisa; Yamashita, Kimihiro; Umegaki, Takao; Miyake, Michihiro.

In: Journal of Materials Research, Vol. 12, No. 5, 05.1997, p. 1205-1209.

Research output: Contribution to journalArticle

Matsuda, M, Ogawa, Y, Yamashita, K, Umegaki, T & Miyake, M 1997, 'Two-stage sintering of dense superconducting YBa2Cu4O8 ceramics', Journal of Materials Research, vol. 12, no. 5, pp. 1205-1209.
Matsuda M, Ogawa Y, Yamashita K, Umegaki T, Miyake M. Two-stage sintering of dense superconducting YBa2Cu4O8 ceramics. Journal of Materials Research. 1997 May;12(5):1205-1209.
Matsuda, Motohide ; Ogawa, Yoshihisa ; Yamashita, Kimihiro ; Umegaki, Takao ; Miyake, Michihiro. / Two-stage sintering of dense superconducting YBa2Cu4O8 ceramics. In: Journal of Materials Research. 1997 ; Vol. 12, No. 5. pp. 1205-1209.
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