Bi,Pb(2223) phase formation in Ag-sheathed tapes: direct in-situ observations by high-temperature neutron-and synchrontron X-ray diffraction

摘要

The Bi,Pb(2223) phase formation inside Ag-sheathed tapes was studied by in-situ high-temperature neutron diffraction. the first direct evidence of the formation of a transient liquid at the early stage of the Bi, Pb(2223) phase formation was provided by an absolute evalaution of the total crystalline matter. A quantitative anlaysis of secondary (Ca,Sr)-cuprates and Ca-rich amorphous phase was carried out. Diffraction experiments on cooling showed that a re-crystallisation of the Bi(2212) phase upon slow cooling is not related to any decomposition of Bi,Pb(2223). In-situ high-energy synchrontron X-ray diffraction and ex-situ standard measurements during the first heating ramp complete this study.