Scully, Scott, Murphy & Presser
Citrate/ethylenediamine gel method for forming high temperature superconductors
 A citrate/ethylenediamine gel method for forming oxide superconductors of the Y-Ba-Cu-O, Bi-Ca-Sr-Cu-O, Tl-Ca-Ba-Cu-O system by employing the nitrates of the individual metals and citric acid. Ethylenediamine is then added to form gels. These materials then undergo calcination and sintering processes. The respective superconductors obtained possess a superconducting zero resistance temperature at 93K, 78K and 118K respectively. 
Industrial Technology Research Institute
Y H C Y C
Y10S H01L C04B Y10S C04B
additional inventional inventional additional inventional
Ru-Shi Chan-Ting Wang-Nang
Liu Chang Wang