On the roles of HEC in Pechini sol-gel method: Enhancement of stability, wettability of the sol and surface roughness of Bi2212 film

Superconducting properties and non-isothermal crystallization kinetics of a Bi2Sr2CaCu2O8+δ (Bi2212) superconductor prepared by the Pechini sol–gel method

“…By contrast, BSCCO superconductors with ne crystallization can be obtained using the sol-gel method at lower temperatures and shorter times due to the high chemical activity, dispersion distribution, short diffusion distance and easy phase formation of precursors. 26,27 Compared to the traditional sol-gel method, the Pechini sol-gel method further optimizes the sol system and improves the superconducting performance. The Pechini solgel method has been widely applied to synthesize hundreds of oxides with high phase purity such as Y 2 O 3 and ZrO 2 and perovskite-structured materials such as LaCoO 3 and Bi 2 Sr 2 -CaCu 2 O 8+d .…”

Preparation of Bi2Sr2CaCu2O8+δ(Bi2212) superconductor by Pechini sol–gel method: thermal decomposition and phase formation kinetics of the precursors

“…Compared with sample F8, the grain size of sample F7 increases which indicates improved crystallization using more sintering time. At the same time, the Bi-based superconductors usually exist in the form of intergrowth phase, the molar fractions of Bi2212 phase in the intergrowth phase are calculated by the following equation [20]. The detail information of the samples is listed in Table 4.…”

“…Meanwhile, assuming that a sol-gel method is performed under a low temperature and a short time of conditions, Bi-based cuprate superconductors with high crystallinity can be synthesized based on some characteristics of precursors, such as high chemical activity, dispersion distribution, short diffusion distance, and easy phase formation. In particular, by means of the Pechini sol-gel method, the sol system can be further optimized and the stability of the sol is also significantly improved, which contributes undoubtedly to acquire high-performance superconductors [19][20][21]. Therefore, to some extent, the studies on the decomposition process and phase formation mechanism of precursors are conducive to understand the nature of the reaction and guide the subsequent heat treatment process clearly.…”

Effect of Er/Y addition on the growth and superconductivity of Bi2212 films

“…We have conducted extensive studies on the preparation of Bi2212 superconducting lms by sol-gel method with aqueous solvents. [28][29][30][31] It was shown that this environmentally friendly and low-cost method can prepare high quality Bi2212 superconducting lms. At the same time, the sol-gel method can maintain homogeneity at the atomic level.…”