Fabrication of YBCO Film Using a New Copper Precursor by Chemical Solution Method

Abstract

YBCO films were fabricated by using a modified precursor solution, which was prepared by mixing yttrium trifluoroacetate, barium trifluoroacetate, and a fluorine-free copper precursor. Crack-free films have been obtained in a rapid pyrolysis process. The texture, microstructure and superconducting properties of films were characterized by xray diffraction, scanning electron microscopy, and the inductive method, respectively. The effect of the heating rate on the phase formation, texture and critical properties (J c ) of YBCO films was investigated. The texture and critical current density varied significantly with the heating rate. Moreover, the J c of 1.7 MA/cm 2 was obtained for YBCO films prepared at the heating rate of 3 K/min.

The Effect of Polyethyleneimine (PEI) on the Texture and Morphology of YBCO Films

“…However, the conventional TFA-MOD method has some disadvantages, such as long calcining time and rapid volatilization of Cu-trifluoroacetate. Therefore, some scholars try their best to perform the chemical modification of precursor solution by using F-free Cu precursor or adding different organic additives [5,6]. The different organic additives can change the surface morphology and superconducting properties of YBCO films, such as diethanolamine (DEA) [7], polyvinyl alcohol (PVA) [8], polyvinyl butyral (PVB) [9], polyvinylpyrrolidone (PVP) [10,11].…”