涂层溶液粘度对SmBa2Cu3O7-x超导薄膜结构和性能的影响

The effect of the solution viscosity on the microstructure and superconducting properties of the SmBa_2Cu_3O_(7-x) films

采用自主开发的无氟化学溶液沉积法在(00l)LaAlO_3单晶片上制备了SmBa_2Cu_3O_(7-x)(SmBCO)超导薄膜,研究了涂层溶液的粘度对SmBCO超导薄膜织构、微结构及超导性能的影响。通过调节前驱溶液中高分子的添加量来调控涂层溶液的粘度。结果表明,不同高分子添加量的涂层溶液制备的薄膜均具有较好的c轴单晶取向,其中高分子添加量为4%的涂层溶液制备的超导薄膜表面更加平整、致密,显示了良好的晶粒连接性。此外,该粘度的涂层溶液制备的薄膜超导转变温度为89.5K,临界电流密度(65K,自场)达到1MA/cm^2以上,显示了较好的超导电性。

SmBCO superconducting films were deposited on （00l）LaAlO3 single crystal substrate by self-devel-oped fluorine-free chemical solution deposition approach.The effect of the solution viscosity on the texture,mi-crostructure and superconducting properties of the films were investigated.In this work,the solution viscosity was adj usted by changing the amount of polymers in the precursor solution.The results indicate that SmBCO films with different viscosities show good c-axis texture of the grains.And the film with 4% polymer addition in the precursor solution has much smoother and denser surface morphologies,showing the good grains connectiv-ity.In addition,this film has a high TC of 89.5 K and J c（65 K,self-field）above 1 MA/cm^2 ,illustrating better superconductivity.