A process 1, further comprising annealing said {HEAD ~ superconducting phase} at a temperature in the range of 250° {TAIL ~ 600° C.} in an oxygen atmosphere 
A process 1 , further comprising annealing said { HEAD ~ superconducting phase } at a temperature in the range of 250 ° { TAIL ~ 600 ° C. } in an oxygen atmosphere
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH