Investigation of the formation of the Bi-2223 phase in multifilamentary Bi-2223/Ag tapes by in situ high temperature neutron diffraction

Results of in-situ diffraction experiments in the investigation of multifil amentary Bi-2223/Ag tape superconductors with neutron radiation are reporte d. The aim is to characterise the formation reaction of the Bi-2223 phase a nd the changes in the secondary phases assemblage under real reaction condi tions without removing of the silver sheath of the composite. Furthermore, the mechanism of the evolution of a fibre texture of the superconducting ph ases Bi-2212 and Bi-2223 are discussed. Additionally, the results of the in -situ diffraction experiments will be related to the characterisation of th e microstructure of quenched specimens done by scanning electron microscopy . Finally, a reaction model of the formation of the Bi-2223 phase within th e composite conductor will be discussed.