Bi-2223银夹板厚膜的载流特性与应变的关系

测量了Bi_1.8Pb_0.4Sr₂Ca₂Cu₃O_y银夹板厚膜的应力与应变、应变和临界电流密度关系,及其在不同应变下的J_c(H)特性.结果表明,在应力-应变曲线上存在两个应变转变,分别对应于Bi_1.8Pb_0.4Sr₂Ca₂Cu₃O_{y关键词：}

THE STRAIN DEPENDENCE OF THE TRANSPORT CURRENT CHARACTERISTICS IN Bi-2223 SILVER CLAMPED THICK FILM

The dependences of stress on strain, strain on the critical current density, and the relation of J_c(H) at several strains were measured in Bi-2223 silver clamped thick film. The results indicate that the stress-strain curve exists two strain transitions which are respectively correspond to the beginning and ending of breaking in Bi_1.8Pb_0.4Sr₂Ca₂Cu₃O_y thick film. At △X/X≤2.5 % , the critical crrrent density J_c decreases slowly with △X/X increasing. At △X/X≥2.5 % , J_c decreases rapidly with △X/X increasing. As strain increases,the characteristics of J_c(H) decrease rapidly and the weak link junctions emerges obviously. The mi-crostructures show that the decrease of J_c and the variance of characteristics of J_c (H) relate to the breaking of intergrains and grains in the thick film.