Control of Microstructures in the YBA2CU3O7-σ system: 1. Reaction with CO2


Controlled reactions have been undertaken between CO2 and polycrystalline YBa2Cu3O7-σ in the temperature range 500°-700°C. Typical reaction products are Y2BaCu05, BaC03 and CuO. Subsequent processing in O2 (e.g. sintering) results in the formation of liquid phases(s) by peritectic reaction at temperatures of 935-975°C, well below the incongruent melting point of YBa2Cu3O7-σ (∼1010°C). This “low temperature” liquid phase is shown to have a dramatic influence on the sintering process, and the resulting microstructures. The reactions are difficult to reverse even after extended times at temperatures >900°C. The results give an indication of the effect of adsorbed CO2 into YBa2Cu3O7-σ powders, albeit on a more localized scale.

This is a preview of subscription content, access via your institution.


  1. 1

    A.I. Kingon, CD. Davis, T.M. Hare, M. Lawrence, H. Palmour III, C.C. Koch and D.G. Haase, submitted to J. Mat. Res.

  2. 2

    A.I. Kingon, M. Lawrence, T.M. Hare, CD. Davis, C.C. Koch and D.G. Haase, ibid, submitted.

  3. 3

    A. Bhargava, M. Heuberger, and R.L. Snyder, Mat. Let. 5 (11,12) 495-8 (1987).

    CAS  Article  Google Scholar 

  4. 4

    P.K. Gallagher, G.S. Grader, H.M. O’Bryan, Mat. Res. Bull. 23., 1491 (1988).

    CAS  Article  Google Scholar 

  5. 5

    T.M. Shaw, IBM T.J. Watson Research Center, Yorktown Heights, Private communication.

  6. 6

    T. Aselage and A. Keefer, J. Mat. Res. 1 (6), 1279-91 (1988).

    CAS  Article  Google Scholar 

Download references

Author information



Corresponding author

Correspondence to Angus I. Kingon.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Kingon, A.I., Davis, C.D., Hare, T.M. et al. Control of Microstructures in the YBA2CU3O7-σ system: 1. Reaction with CO2 . MRS Online Proceedings Library 169, 253–256 (1989).

Download citation