Improvement in structure and superconductivity of YBab>2b>Cub>3b>Ob>6+b>b>δb> ceramics superconductors by optimizing sintering processing

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• 作者：Fei JIN (金 菲) ; Hui ZHANG (张 辉) ; Wenzhang WANG (王文章) ; Xiang LIU (刘 翔) ; Qingming CHEN (陈清明) ; ^{qmchen99@163.com}
• 关键词：YBa2Cu3O6+δ ; sol-gel method ; sintering processing ; superconducting property ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：35
• 期：1
• 页码：85-89
• 全文大小：2972 K
• 卷排序：35

文摘

Polycrystalline YBa2Cu3O6+δ bulks were synthesized by sol-gel method. Sintering processing played a vital role in the evolution of phase structure and microstructure, and thus significantly influenced their superconducting properties. The influence of calcination temperature, sintering temperature, on the bulks structure, morphology and superconducting behaviors were investigated. The results showed that the oxygen content drastically increased with calcination temperature and sintering temperature. The SEM images revealed that the grains grew up monotonously with increase of calcination temperature. With increased calcination and sintering temperature, the resistivity was reduced gradually and the superconducting properties increased. Moreover, it was found that the optimal superconducting properties (with the highest superconducting transition temperature Tconset and the narrowest transition width ΔT) were obtained at calcination temperature of 900 °C and sintering temperature of 950 °C.