TITLE

Effect of Li doping on the critical temperature and glass formation in the Bi–Sr–Ca–Cu–O system

AUTHOR(S)
Volkov, M. P.; Melekh, B. T.; Bakharev, V. I.; Kartenko, N. F.; Matykin, N. V.; Filin, Yu. N.
PUB. DATE
January 1999
SOURCE
Physics of the Solid State;Jan99, Vol. 41 Issue 1, p15
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A study has been made of the glass-forming ability, structure, and superconducting properties of Bi[sub 2.2]Sr[sub 1.8]Ca[sub 1.05]Cu[sub 2.15]Li[sub x]O[sub y] and Bi[sub 2.2]Sr[sub 1.8]Ca[sub 1.05]Cu[sub 2.15 - x]Li[sub x]O[sub y] (x = 0; 0.3; 0.5; 0.7). The compounds were melted by rf at T = 1300 - 1500 °C. Rapid quenching produces glassy alloys whose glass-forming ability is the highest when lithium is substituted for copper. Glass annealing at 700-800°C results in the formation of the HTSC phase 2212 with a critical temperature of up to 91 K. In lithium-doped samples the HTSC phase forms at lower temperatures and shorter anneals and it depends on the cooling rate following the anneal. The composition and properties of the 2212 phase depend nonmonotonically on the anneal time. The lattice parameter C of the 2212 phase increases with increasing lithium content.
ACCESSION #
7323121

 

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