THE EFFECT OF AU DIFFUSION ON STRUCTURAL AND SUPERCONDUCTING PROPERTIES OF YBACUO

DZHAFAROV T., ALTUNBAS M., VARILCI A., KUCUKOMEROGLU T.

MATERIALS LETTERS, cilt.25, ss.81-86, 1995 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 25
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1016/0167-577x(95)00141-7
  • Dergi Adı: MATERIALS LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.81-86
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

The diffusion doping of YBa2Cu3O7-x (YBaCuO) by gold causes a significant increase of the lattice parameter c by about 0.20%. This effect, resulted from a replacement of a copper ion by a gold ion, is used for examination of Au diffusion parameters in YBaCuO. It was shown that the diffusion coefficient of gold in the range 500-870 degrees C changed from 1 X 10(-11) to 6 X 10(-10) cm(2)/s with an activation energy of about 0.85 eV. For the gold-doped sample, the critical temperature increased by 3 K when compared with that of undoped YBaCuO. The critical current density increased from 50 A/cm(2) for the undoped sample to 280 A/cm(2) for the gold-doped YBaCuO. The possible reasons for the observed increases in T-c and J(c) due to gold diffusion in YBaCuO were discussed.