Annealing effects on the modulation structure in the Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>x</sub> superconductors
L W Zhang; T G Chen; X C Wu; T S Shi; L W Zhang; Inst. of Metall., Acad. Sinica, Shanghai, China; T G Chen; Inst. of Metall., Acad. Sinica, Shanghai, China; X C Wu; Inst. of Metall., Acad. Sinica, Shanghai, China; T S Shi; Inst. of Metall., Acad. Sinica, Shanghai, China
Журнал:
Superconductor Science and Technology
Дата:
1995-04-01
Аннотация:
Annealing effects on the modulation structure of Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>x</sub> superconductors were studied. It was found that upon annealing in flowing oxygen at 650 degrees C, the modulation structure was changed from the pure Pb-type, via the mixed type, finally to the pure Bi-type. When the specimen was subjected to sequent annealing in flowing nitrogen at 650 degrees C, the modulation was changed reversibly from the pure Bi-type via the mixed type to the pure Pb-type. The change in the modulation was closely related to the loss or redistribution of Pb ions. The inhomogeneous distribution of Pb ions led to the mixed modulation.
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