Synthesis of BiPbSrCaCuO superconductors with substitution of Sr by Ag

The Bi- based superconductor system exhibit three different phases described by a general formula Bi2Sr2Can-1CunO2n+4 related to the value of (n=1,2 and 3)which are specified by names (2201- Tc ~10K ,2212- Tc ~80K and 2223- Tc ~110K).The desirable phase is the n=3 (Bi2Sr2Ca2Cu3O10+δ) because its higher Tc . It is still very difficult to prepare its pure phase because of its special synthetic condition. The above three phases can be used separately as well as in mixture to form superconductors in various forms. Phase transformation from Bi-2212 to Bi – 2223 often takes place during thermal treatments, this phase transformation mad the thermal processes of BSCCO superconductors very complicated as confirmed by Li et al.