Effect of the fluorine substitution for oxygen in the heavily Pb-doped Bi-2212 phase of (Bi, Pb)2(Sr, Ba)2CaCu2O8

Effect of the fluorine substitution for oxygen in the heavily Pb-doped Bi-2212 phase of (Bi, Pb)2(Sr, Ba)2CaCu2O8
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(Bi, Pb)2(Sr, Ba)2CaCu2O8 重掺杂 Bi-2212 相中氟取代氧的影响

DOI:
10.1088/1742-6596/1975/1/012007
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发表时间:
2021
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
M. Kato
M. Kato
中科院分区:
--
文献类型:
--
作者:
R. Ito;T. Kawamata;T. Noji;M. Kato

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制备了Bi 2− xPbxSr 2CaCu 2 O 8− zFz(x(Pb)= 0.6和1.0)的Bi-2212多晶样品。当x(Pb)= 0.6时,所有样品几乎都是Bi-2212结构的单相。当z(F)= 0时,Tc = 82 K,当z(F)= 0.2-0.6时,Tc增加到86-88 K。这可能是由于F−的引入减少了O位的空位量。此外,我们还成功地合成了部分Ba取代的Bi-2212相Bi 1.4 Pb 0.6 Sr 2− y Ba y CaCu 2 O 7.8 F 0.2,其中0≤ y(Ba)≤ 0.5。当y(Ba)= 0.5时,Tc增加到98 K.通过Ba取代的Tc的提高可能是由于Cu和顶端氧之间的距离的增加。
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.
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