Abstract
Preparation of (B 1− x C x )(Sr 1− y Ba y ) 2Ca 2Cu 3O z has been studied using high-pressure synthesis technique to improve sample quality. Samples were prepared from various starting compositions of 0.2≤ x≤0.8 and 0≤ y≤1. Nearly single-phased samples were obtained for (B 0.6C 0.4)(Sr 1− y Ba y ) 2Ca 2Cu 3O z (0≤ y≤0.75) and (B 1− x C x )-(Sr 0.25Ba 0.75) 2Ca 2Cu 3O z (0.3≤ x≤0.6). We have found that the partial substitution of Ba is effective to improve the sample quality as well as to enhance the T c. The C substitution was also demonstrated to affect the sample preparation and the physical properties. Based on the substitution study, a maximum T c of 120 K was observed for the sample with a starting composition of (B 0.65C 0.35)(Sr 0.3Ba 0.7) 2Ca 2Cu 3O 9+ δ . Critical current density ( J c) and irreversibility field ( H irr) were estimated from magnetization measurements. The J c at 77 K in a field of 1 T was about 1.1×10 4 A/cm 3 and the H irr at 77 K was about 2.5 T. The H irr was well-described by H irr= a(1− T/ T c) n with a=39.1 and n=2.38.
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