Synthesis of stable precursor solution for MOD-processing of YBCO coated conductors

• Published in: Physica. C, Superconductivity Superconductivity, 2006-10, Vol.445-448, p.574-577
• Main Authors: Kim, Young-Kuk, Yoo, Jaimoo, Chung, Kookchae, Ko, Jaewoong
• Format: Article
• Language: English
• Subjects: MOD; Precursor solution; YBCO
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2006.04.051

MOD precursor solutions for YBCO coated conductors were synthesized by either adding organic additives or substituting F-free Cu precursor for Cu-trifluoroacetate (TFA) to improve the stability of the precursor solution. The precursor solution without any significant change in the viscosity was synthesized by incorporating polyvinylpyrrolidone (PVP) and thickness of precursor film after calcination was enhanced. In addition, F-free Cu precursor was employed to synthesize the precursor solution with less fluorine content. Stable precursor solution without time-dependent viscosity degradation was obtained and the crack-free and 1.7μm thick precursor film was formed after fast calcination at 400°C in wet O2 atmosphere. A 0.5μm-thick YBCO film was formed after annealing in wet Ar/O2 mixed gas and showed critical current density of 0.8MA/cm2. Further optimization of processing conditions such as total pressure, oxygen partial pressure, annealing temperature, etc. is in progress to improve critical current. This chemical modification approach is a possible candidate for improving stability and performance of MOD-processing of YBCO coated conductor.