在溶胶-凝胶法中甲酰胺的添加量对Tl-2212超导薄膜的影响  

Effects of Formamide Addition Amount on Tl-2212 Superconducting Films by a Sol-gel Method

作　　者：黄国华[1] 蒋艳玲[1] 方凤才[1] 谢清连[1] 唐平英[1] 岳宏卫[2] 王娇[1] 曹奇志[1] 张晶[1] 黄佳 

机构地区：[1]广西师范学院,广西南宁530023 [2]桂林电子科技大学,广西桂林541004

出　　处：《稀有金属材料与工程》2016年第S1期55-58,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(51062001);广西教育厅项目(2013ZD039);广西高校优秀人才资助计划项目(桂教人[2011]40号);广西高校新型电功能材料重点实验室开放课题;广西师范学院化学博士点建设基金项目(1750)

摘　　要：以乙酸盐为起始原料,甲醇为溶剂,甲酰胺为添加剂,在铝酸镧(LAO)(00l)衬底上生长Tl2Ba2CaCu2O8(Tl-2212)超导薄膜。结果表明,在溶胶中加入甲酰胺,对先驱膜的形貌,以及超导薄膜的形貌、结构、性能有较大影响;当甲酰胺添加量为甲酰胺:乙酸钡(摩尔比)=(15~25):1时,可以制备出具有致密的晶体结构、高度c轴取向的外延Tl-2212超导薄膜,其薄膜具有较好的电学性能,临界温度Tc可达105.8K,临界电流密度Jc可达0.75MA/cm2(77K,0T)。Tl_2Ba_2CaCu_2O_8(Tl-2212) superconducting films were grown on LaAlO_3(001) substrates by a sol-gel method in which the required sol was prepared using methanol as solvent, acetates as starting materials, and formamide as chemical additives. Results show that the addition amount of formamide has a great influence on the morphology of precursor, phase structure and property of Tl-2212 films. With formamide adding amount of formamide: barium acetate(mole ratio) =(15~25):1, Tl-2212 superconducting films can be prepared. The films possess excellent c-axis orientation, dense crystal structure and excellent electrical property. The critical temperature Tc of the best sample is around 105.8 K, and the critical current density Jc around 0.75 MA/cm2(77 K, 0 T).

关 键 词：Tl-2212超导薄膜 溶胶-凝胶法 甲酰胺 

分 类 号：TB383.2[一般工业技术—材料科学与工程]