ELECTRICAL AND MAGNETIC-PROPERTIES OF HONEYCOMB-TYPE BI(PB)-SR-CA-CU-O SUPERCONDUCTORS

ALTUNBAS M., YANMAZ E., NEZIR S., KARAL H., VIDADI Y.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.215, ss.263-266, 1994 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 215
  • Basım Tarihi: 1994
  • Doi Numarası: 10.1016/0925-8388(94)90851-6
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.263-266
  • Karadeniz Teknik Üniversitesi Adresli: Hayır

Özet

Bi2O3, PbO, SrCO3, CaO and CuO compounds have been dissolved in liquid ammonium nitrate in order to produce Bi1.8Pb0.2Sr2Ca2Cu3O10 (2223) superconductors of honeycomb-type structure. The resulting metal nitrate and nitrate complexes have been decomposed in an environment activated by the exothermic reaction. Powders, homogeneous on the molecular scale, containing the binary and ternary oxides as the necessary constituents have been produced. Samples in the form of pellets have been annealed at 845 degrees C for 25-125 h. This honeycomb-type BSCCO superconductor with a critical temperature T-c=110 K and a density of 3 g cm(-3) has been produced. The volume of the sample has increased by about 25%-40% after annealing. Electrical and magnetic properties of the samples have been investigated in three regions: the superconducting region TT-c+Delta T-F. It has been found that it is possible to have a controllable variation in critical current density and that the optimum annealing time was about 100 h in order to obtain its maximum value.