Microstructural and electrical transport properties of uniaxially pressed Bi1.65Pb0.35Sr2Ca2.5Cu3.5O10+δ ceramic superconductors

R. F. JARDIM; A. CRUZ-GARCÍA; O. VAZQUEZ-ROBAINA; J. R. FERNÁNDEZ-GAMBOA; P. MUNÉ; E. ALTSHULER

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

SPRINGER

Lugar: Berlin; Año: 2018 vol. 29 p. 6188 - 6199

0957-4522

We have studied the effect of the pelletization pressure on microstructural and electrical transport properties of superconducting ceramics with starting composition given by the formula Bi1.65Pb0.35Sr2Ca2.5Cu3.5O10+δ. The experimental data of electrical measurements was processed in order to obtain the weak-link resistivity, the orientation probability of the grains? a-axes along a certain preferential direction, the slope of the linear part in the temperature dependence of the ab-planes resistivity, and the intrinsic effective anisotropy of the grains, of each sample. In contrast with the behaviour of Bi1.65Pb0.35Sr2Ca2Cu3O10+δ ceramics, the Ca, Cu enriched samples exhibit a reduction of their effective anisotropy at sample level and weak links resistivity with increasing compacting pressures. In addition, a compacting pressure of around 488 MPa may affect considerably the electrical and structural parameters of the material. The results suggest that a combined effect of the pelletization pressure and the doping with Ca and Cu can be used to improve the electrical transport properties of these materials for technological applications.