DIFFUSION OF AG IN BI(PB)-SR-CA-CU-O SUPERCONDUCTORS


DZHAFAROV T., COMERT H., ALTUNBAS M., ALVER U. , KUCUKOMEROGLU T. , KOPYA A.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.221, ss.264-266, 1995 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 221
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1016/0925-8388(94)01472-8
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Sayfa Sayıları: ss.264-266

Özet

The Ag diffusion in the superconducting oxide ceramic Bi1.6Pb0.4Sr2Ba2Cu3Ox has been studied over the temperature range 350-800 degrees C using the technique of successive removal of thin layers and measurement of the sample resistivity. The temperature dependence of the Ag diffusion coefficient is given by the relation D = 5.2 x 10(-3) exp(-0.70/kT). The observed fast Ag diffusion is assigned to impurity migration through the defects of ceramic samples (the surface of pores, grain boundaries etc.). The current-voltage characteristics of Ag-Bi(Pb)-Sr-Ca-Cu-O-Ag structures at room temperature became markedly degraded. It is discussed in relation to the redistribution of Ag via diffusion (with D approximate to 10(-12) cm(2) s(-1)) from the metallic layer into the superconductor.