A kinetic mechanism for the formation of aligned (Bi,Pb)2Sr 2Ca2Cu3O10 in a powder-in-tube processed tape

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Abstract
A two‐step process is proposed for the formation of c‐axis aligned (Bi,Pb)2Sr2Ca2Cu3O10+δ [Bi(2:2:2:3)] platelets in a silver sheath. The process involves: (1) the formation of c‐axis aligned (Bi,Pb)2Sr2CaCu2O8+δ at early stage of heat treatment and (2) the subsequent intercalation of Ca–Cu–O layers to form Bi(2:2:2:3). This is based on the measurements of (1) the rocking curves for c‐axis alignment and the two theta scans for the Bi(2:2:2:3) conversion ratio, both by a transmission x‐ray technique, and (2) a quantitative study of the phase conversion due to intercalation of Ca–Cu–O layers into existing Bi(2:2:1:2) by transmission electron microscopy.

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