Open AccessEffect of the fluorine substitution for oxygen in the heavily Pb-doped Bi-2212 phase of (Bi, Pb)2(Sr, Ba)2CaCu2O8
Author(s) -
R. Ito,
Takayuki Kawamata,
Takashi Noji,
Masaru Kato
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1975/1/012007
Subject(s) - analytical chemistry (journal) , oxygen , crystallite , doping , phase (matter) , single phase , fluorine , crystallography , materials science , chemistry , metallurgy , organic chemistry , chromatography , electrical engineering , engineering , optoelectronics
Polycrystalline samples of the Bi-2212 phase of Bi 2− x Pb x Sr 2 CaCu 2 O 8− z F z with x (Pb) = 0.6 and 1.0 have been prepared. All the samples are almost of the single phase with the Bi-2212 structure for x (Pb) = 0.6. The value of T c ∼ 82 K for z (F) = 0 increases up to 86–88 K for z (F) = 0.2–0.6. This may be due to the decrease in the amount of vacancy at the O-site by the introduction of F − . In addition, we have successfully synthesized the partially Ba-substituted Bi-2212 phase of Bi 1.4 Pb 0.6 Sr 2− y Ba y CaCu 2 O 7.8 F 0.2 with 0 ≤ y (Ba) ≤ 0.5. T c increases up to 98 K for y (Ba) = 0.5. The enhancement of T c through the Ba-substitution may be due to the increase in the distance between Cu and the apical oxygen.