Improvement in structure and superconductivity of YBa2Cu3O6＋δ ceramics superconductors by optimizing sintering processing  

作　　者：JIN Fei ZHANG Hui WANG Wenzhang LIU Xiang CHEN Qingming 金菲;张辉;王文章;刘翔;陈清明(Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China)

机构地区：Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

出　　处：《Journal of Rare Earths》2017年第1期85-89,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(11564021)

摘　　要：Polycrystalline YBa2Cu3O6＋δbulks 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 Tc^onset and the narrowest transition width ΔT） were obtained at calcination temperature of 900℃ and sintering temperature of 950 ℃.Polycrystalline YBa2Cu3O6＋δbulks 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 Tc^onset and the narrowest transition width ΔT） were obtained at calcination temperature of 900℃ and sintering temperature of 950 ℃.

关 键 词：YBa2Cu3O6＋δ sol-gel method sintering processing superconducting property rare earths 

分 类 号：TM26[一般工业技术—材料科学与工程]