IMPROVEMENT OF PHASE PURITY AND ACCELERATED FORMATION OF THE TL-1223 PHASE FROM THE STOICHIOMETRIC COMPOSITIONS (TL0.6PB0.2BI0.2)(SR2-XBAX)CA2CU3O9 (X=0.2-0.3)
Journal
Physica C
Journal Volume
222
Journal Issue
3-4
Pages
278-282
Date Issued
1994
Author(s)
Abstract
We report an efficient and highly reproducible method for the preparation of the almost monophasic Tl-1223 phase by partial substitution of Ba2+ into Sr2+ sites in the stoichiometric compositions of (Tl0.6Pb0.2Bi0.2)(Sr2-xBax)Ca2 Cu3O9 (x=0.2-0.3). The as-synthesized samples have a superconducting transition temperature around 115 K which can be further increased up to 122 K after post-annealing at 820°C for 20 h in oxygen. © 1994.
Type
journal article