Effect of Na substitution on superconducting properties of Bi-2212 ceramics prepared by Sinter-Forged process

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• 作者：O. Nane^a ; ^{onurnane@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; B. Ö ; zç ; elik^b ; A. Sotelo^c ; M.A. Madre^c
• 关键词：Bi-2212 ; Sodium substitution ; Texturing ; Anisotropy ; Sinter-Forging
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：37
• 期：3
• 页码：1007-1012
• 全文大小：2176 K

文摘

Bulk textured Bi₂Sr₂Ca_1−xNa_xCu₂O_y (x = 0.0, 0.05, 0.075 0.1, 0.15, and 0.20) ceramics have been prepared by a polymer solution method followed by sinter-forging process. The microstructure and superconducting properties of textured samples were affected by Na substitution. According to XRD data, all samples show that Bi-2212 phase is the major one, and main peaks corresponded to the (00ℓ) diffractions confirming that the crystallographic c-axis is perpendicular to the surface. SEM micrographs showed that samples are composed of well-stacked and oriented grains. The best critical temperature, T_C, was measured as 85.6 K for x = 0.075. The critical current density Jc, values decrease gradually with the increase of applied magnetic field. The maximum calculated Jc was 1.38 × 10⁵ A/cm² at 10 K for 0.075 Na sample which is about four times higher than the 0.34 × 10⁵ A/cm² value determined for the pure sample. The anisotropic properties of these textured materials have been investigated using magnetic measurements.