The influence of synthesis environmental and time on volumetric characteristics of BSCCO superconducting ceramic obtained by spray-frozen, freeze drying technique

摘要

The influence of the intermediate heat treatment time and synthesis environment in which samples with nominal composition Bi:Pb:Sr:Ca:Cu=1.7:0.3:2.0:2.5:3.5 have been placed on the phase content and volumetric characteristics of the ceramic were studied. Final sintering (235h) of the pellets was done by placing them "in" and "on powder" calcinated in air at 84.7 deg.C for 100 hours with composition as above. During intermediate heat treatment (IHT) relative volume changes (ΔV/Vo) attein 1.0/100 for 7 h and a minimum value of -5.0/100 for 3 h.