Eur. Phys. J. AP 2, 145-149 (1998)
https://doi.org/10.1051/epjap:1998177

Influence of the secondary phases and post-annealing on the transport current density of sinter-forged (Bi, Pb)-2223 ceramics^*

¹ ISMRA, CRISMAT (CNRS UMR 6508), 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France
² ISMRA, LERMAT (CNRS UPRES-A 6004), 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France

Corresponding author: v.rouessac@crismat.ismra.fr

Received: 13 June 1997
Accepted: 26 January 1998
Published online: 15 May 1998

Abstract

Transport critical current measurements were performed at 77 K on bulk silver-less (Bi, Pb)₂Sr₂Ca₂Cu₃O_10+x ceramics textured by slow sinter-forging process. The influences of the 85 K superconductive 2212 phase and non-superconductive secondary phases (Sr_xCa_1−x)₂PbO₄, (Sr,Ca)₁₄Cu₂₄O_y and (Sr_xCa_1−x)₂CuO₃, are discussed in terms of their amounts, their grain sizes and shapes and their distribution among the 2223 matrix. The importance of the temperature profile and the atmosphere the annealing that follows the sinter-forging process is clearly demonstrated.