TY - JOUR
T1 - Effects of lithium doping on the formation and microstructure of bulk Bi‒Sr‒Ca‒Cu‒O
AU - Schwartz, J.
AU - Wu, S.
N1 - Funding Information:
This work was supported in part by the Science and Technology Center for Superconductivity. The SEM and SIMS were carried out in the Center for Microanalysis of Materials, University of Illinois, which is supported by the U.S. Department of Energy under contract DEFG02-91-ER45439. Special thanks is given to Dr. Judith Baker for performing the SIMS analysis and Prof. S. Landsberger for performing the NAA. Special thanks is also given to C.A. Gianino and J.C. Rynes for their assistance.
PY - 1991/12/2
Y1 - 1991/12/2
N2 - The effects of Li doping on Bi2Sr2CaCu2Ox pellets has been studied by considering Li substitution for Sr and Cu and Li additions to stoichiometric Bi2Sr2CaCu2Ox. As the Li substitution reduces the melting temperature by as much as 160°C, melting studies were performed to determine the sintering conditions for melt-quenching. While a variety of stoichiometries all exhibited S{single bond}N transitions above 80 K, the transition of Bi2Sr2Ca(Cu0.55Li0.45)2 Ox was significantly narrower than other cation combinations. However, Li did not increase Tc relative to Bi2Sr2CaCu2Ox [1-4]. Microstructural analysis by SEM and SIMS indicated that the Bi, Sr, Ca and Cu are all distributed uniformly throughout the pellet, while the Li distribution is quite inhomogeneous. Furthermore, SIMS depth profiling into the Ag/BSCCOLi interface showed that although the Bi:Sr:Ca:Cu ratio remains relatively constant, the Bi:Li ratio increases by over 100%, indicating that the Li penetrates the Ag interface to a greater extent than the other cations and that Li doping may effect the behaviour at the BSCCO/Ag interface.
AB - The effects of Li doping on Bi2Sr2CaCu2Ox pellets has been studied by considering Li substitution for Sr and Cu and Li additions to stoichiometric Bi2Sr2CaCu2Ox. As the Li substitution reduces the melting temperature by as much as 160°C, melting studies were performed to determine the sintering conditions for melt-quenching. While a variety of stoichiometries all exhibited S{single bond}N transitions above 80 K, the transition of Bi2Sr2Ca(Cu0.55Li0.45)2 Ox was significantly narrower than other cation combinations. However, Li did not increase Tc relative to Bi2Sr2CaCu2Ox [1-4]. Microstructural analysis by SEM and SIMS indicated that the Bi, Sr, Ca and Cu are all distributed uniformly throughout the pellet, while the Li distribution is quite inhomogeneous. Furthermore, SIMS depth profiling into the Ag/BSCCOLi interface showed that although the Bi:Sr:Ca:Cu ratio remains relatively constant, the Bi:Li ratio increases by over 100%, indicating that the Li penetrates the Ag interface to a greater extent than the other cations and that Li doping may effect the behaviour at the BSCCO/Ag interface.
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U2 - 10.1016/S0921-4534(05)80240-0
DO - 10.1016/S0921-4534(05)80240-0
M3 - Article
AN - SCOPUS:0026414851
SN - 0921-4534
VL - 190
SP - 169
EP - 171
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 1-2
ER -