SOME PROPERTIES OF HONEYCOMB-TYPE BI1.6PB0.4SR2CA3CU4OY SUPERCONDUCTORS

NEZIR S., KARAL H., KUCUKOMEROGLU T., VIDADI Y., ALTUNBAS M.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.218, sa.1, ss.47-50, 1995 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 218 Sayı: 1
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1016/0925-8388(94)01345-4
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.47-50
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

A Bi-based superconductor of nominal composition Bi1.6Pb0.4Sr2Ca3Cu4Oy was prepared using Bi2O3, PbO, SrCO3, CaO and CuO powders and liquid ammonium nitrate as solvent and homogenizer. For comparison, another superconductor with nominal composition Bi1.8Pb0.2Sr2Ca2Cu3Ox was obtained using the same method and conditions. It was observed that the ceramic has a honeycomb granular structure, a transition temperature of 110 K, an increased thermal expansion coefficient (8.7x10(-6) K-1) and a fourfold higher critical current density (25 A cm(-2)). The volume of the sample increased during annealing (for 100 h at 845 degrees C). The phases existing in this new type superconductor were determined. The composition and temperature dependences of phase transition characteristics, resistivity and inductance changes were investigated. The height of the energy barrier separating the metastable local superconducting phase and the normal metallic phase was found to be 0.34 eV in the temperature interval 110 K