热分解工艺对溶胶-凝胶法制备 Tl-2212 超导薄膜特性的影响

Effects of Thermal Decomposition Process on the Properties of Tl-2212 Superconducting Thin Films Prepared by Sol-Gel Method

研究了在铝酸镧(LAO)基片上TBCCO凝胶膜的热分解条件对Tl2Ba2CaCu2O8(Tl-2212)薄膜的结晶质量、表面形貌、组分比例的影响。SEM和XRD研究表明,凝胶膜经过适当条件热分解后,可以制作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。其临界温度T c可达106 K,临界电流密度J c可达0.83 MA/cm2(77 K,0 T)。

The effects of thermal decomposition process of TBCCO sol films prepared on lanthanum aluminate substrates on the crystal quality, surface morphology and chemical composition of Tl2Ba2CaCu2O8 （Tl-2212） films were investigated. The SEM and XRD results showed that Tl-2212 superconducting thin films can be prepared by gel films through thermal decomposition process under suitable conditions. The films possess excellent c-axis orientation, dense crystal structure and excellent electrical property. The critical temperatures Tc of the Tl-2212 films are around 106 K, and the Jc around 0.83 MA/cm2 （77 K, 0 T）.