Search for content and authors

Effect of preparation conditions on superconducting properties of (Bi,Pb)-Sr-Ca-Cu-O glass-ceramics

Maria Gazda 3B. Kusz 3Jaroslaw Pietosa 1A Bienias 1Roman Puzniak 1S. Stizza 2S. Chudinov 2R. Natali 2

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. University of Camerino, INFM, Camerino, Italy
3. Gdansk University of Technology, Narutowicza 11/12, Gdańsk 80-952, Poland


Granular metals and superconductors are very interesting, because of their unique properties and applications. One of the methods of preparing such materials is a glass-ceramics route, that is, by annealing of an amorphous solid in the way leading to partial crystallisation. In this work we present the influence of annealing conditions on superconducting properties of (Bi,Pb)-Sr-Ca-Cu-O high Tc superconductors prepared by a glass-ceramic method.
Superconducting (Bi,Pb)-Sr-Ca-Cu-O glass-ceramic samples were obtained by annealing of amorphous (Bi0.8Pb0.2)4Sr3Ca3Cu4Ox at temperatures between 750C and 865C for time intervals from 1 minute to 43 hours. The measurements of the temperature dependence of resistivity in annealed samples were carried out between 3 K and 300 K. Critical current densities were determined from magnetic measurements.
The electrical and superconducting properties of the material change during annealing because oxide superconductors belonging to the bismuth family (Bi,Pb)2Sr2CuOx (2201), (Bi,Pb)2Sr2CaCu2Ox (2212) and (Bi,Pb)2Sr2Ca2Cu3Ox (2223) crystallise forming a granular metal and superconductor. Low temperature resistivity and magnetic measurements show that during the growth of crystalline phases superconducting properties develop rapidly. Measurements of magnetisation reveal that isolated grains of superconducting 2212 phase form in the first minute of annealing at 850 C. Further development of superconducting phases leads to subsequent improvement of superconducting properties. Properties of the material (e.g. room temperature resistivity, critical temperature, critical current) and kinetics of changes depend on the temperature and time of annealing. The highest critical current densities (106 A/cm2 at 5 K in 1 T) were obtained for samples annealed at 850 C for 43 h.


Legal notice
  • Legal notice:

Related papers

Presentation: oral at E-MRS Fall Meeting 2004, Symposium E, by Maria Gazda
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-05-20 15:54
Revised:   2009-06-08 12:55