Densification Behavior of YBa2Cu3O7-δ Sintering

  • H. Sakai
  • M. Yoshida
  • K. Matsuhiro
Conference paper


The densi fication of YBa2Cu3O7-δ to 5.9g/cm3 was achieved by the reaction sintering at 950°C for 3h with using the mixture of Y2 BaCuO5 and the unknown X phase as a starting powder under the controlled oxygen partial pressure ranging 0.1 to 0.2atm. The better sinterability was caused by the liquid phase formation during sintering. The X phase decomposed to BaCuO2 and the CuO-rich unknown phase around 600°C in oxygen partial pressure ranging 0.1 to 0.2atm. Y2BaCuO5 reacted with BaCu2 in the liquid phase formed from the CuO-rich phase above 820°C. The formation of YBa2 Cu3 O7-δ and the densi fication proceeded simultaneously, hence the high density was achieved. On the other hand the X phase oxidized to Ba3 Cu5 O8 in oxygen partial pressure ranging 0.5 to 1.0atm. Y2BaCuO5 reacted with Ba 3Cu5 O8 above 900° C with small amount of liquid phase. YBa2 Cu3 O7-δ densi fied insufficiently because the densi fication started after the formation of YBa2 Cu3 O7-δ.


Oxygen Partial Pressure Oxygen Atmosphere Reaction Sinter Densification Behavior High Oxygen Partial Pressure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    T.Yamamoto, T.Furusawa, H.Seto, K.Park, K.Kuwahara, T.Hasegawa, K.Kishio, K.Kitazawa and F.Fueki: J. Jpn. Soc. Powder and Powder Metall. 35(5)(1988)333.CrossRefGoogle Scholar
  2. [2]
    T.Kasakoshi, Y.Ogata, Y.Iyori, K.Maruta and T.Iimura: Proc. Fall Meeting of Jpn. Soc. Powder and Powder Metallurgy 1987, 3–10.Google Scholar
  3. [3]
    N.Uno, N.Enoraoto, Y.Tanaka and H.Takami: Jpn. J. Appl. Phys. 27(6)(1988)L1003.ADSCrossRefGoogle Scholar
  4. [4]
    K.Kishio, J.Shimoyama, T.Hasegawa, K.Kitazawa and K.Fueki: Jpn. J. Appl. Phys. 26(7)(1987)L1228.ADSCrossRefGoogle Scholar
  5. [5]
    R.S.Roth, K.L.Davis and J.R.Dennis: Adv. Ceram. Mater. 2(3B)(1987)303.ADSGoogle Scholar
  6. [6]
    Y.Ikeda, Y.Oue, K.Inaba, M.Takano, Y.Bando, Y.Takeda, R.Kanno, H.Kitaguchi and J.Takeda: J. Jpn. Soc. Powder and Powder Metall. 35(5)(1988)329.CrossRefGoogle Scholar

Copyright information

© Springer Japan 1989

Authors and Affiliations

  • H. Sakai
    • 1
  • M. Yoshida
    • 1
  • K. Matsuhiro
    • 1
  1. 1.Materials Research LaboratoryNGK Insulators, Ltd.Mizuho-ku, Nagoya, 467Japan

Personalised recommendations