Title :
Bulk processing of HgBaCuO high T/sub c/ superconductors by a two-zone technique
Author :
Wolters, C. ; Amm, K.M. ; Sun, Y.R. ; Schwartz, J.
Author_Institution :
Nat. High Magnetic Field Lab., Florida State Univ., Tallahassee, FL, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
Hg1201 superconductors have been synthesized from Ba-Cu-O precursors in a two zone assembly. Critical temperatures of 92 K as prepared and 95 K after oxygen annealing resulted. The Hg1201 phase forms at mercury pressures above 6 bar (800/spl deg/C) and at temperatures between 750/spl deg/C and 850/spl deg/C. The effect of dopants on melting and annealing temperatures of the precursor materials has also been studied. After Li doping of up to 20%, melting peaks shift to lower temperatures and broaden significantly.<>
Keywords :
annealing; barium compounds; high-temperature superconductors; impurities; lithium; mercury compounds; superconducting transition temperature; zone melting; 6 bar; 750 to 850 C; 92 K; 95 K; HgBa/sub 2/CuO; HgBa/sub 2/CuO:Li; Li doping; annealing; annealing temperature; critical temperature; dopant effect; melting temperature; two-zone technique; Annealing; Assembly; Doping; Heating; High temperature superconductors; Land surface temperature; Mercury (metals); Superconducting materials; Superconducting transition temperature; Superconductivity;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
