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장호연,도부안광,토신전농,청수현사,추빈량삼,강본당일,송진태,Jang, Ho-Yeon,Watanabe, Yasuhiro,Doshida, Yutaka,Shimizu, Kenji,Okamoto, Yoichi,Akibama, Ryozo,Song, Jin-Tae Materials Research Society of Korea 1991 한국재료학회지 Vol.1 No.2
The as-grown $YBa_2Cu_3O_{7-x}$ superconducting thin films on MgO(100) substrate have been prepared by a reactive coevaporation method. The superconducting transition temperature, surface morphology and crystalline quality were examined as a function of the substrate temperature ranging from $450^{\circ}C$ to $590^{\circ}C$. From the reflection high energy electron diffraction (RHEED) analysis, it was found the film consisted of almost amorphous phase with a halo pattern deposited at the substrate temperature of $450^{\circ}C$. The film deposited at the substrate temperature of $510^{\circ}C$ consisted of polycrystalline phase, showing a broad ring pattern. On the other hand, for the film deposited at $590^{\circ}C$, RHEED showed spotty pattern indicating that this film consisted of single crystal phase. It has rough film surface due to the surface outgrowth. The surface outgrowth increased as the substrate temperature increased from $510^{\circ}C$ to $590^{\circ}C$. the surface outgrowth may be due to the anisotropic growth rate. The highest transition temperature obtained in this study was $Tc_{zero}$ of 83K with $Tc_{onset}$ of 88K for the film deposited at $590^{\circ}C$ using activated RF oxygen plasma.
스크린 인쇄법에 의한 YBa2Cu3O7-x/ Ag 고온산화물초전도 후막의 제작
송진태,장호정,도부안광,토신전풍,청수현사,추병량삼 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.9
Superconduction YBa₂Cu₃0_(7-x)./Ag composite thick films on a YSZ substrate were prepared by the screen printing method. Microstructure and supercduction properties such as zero-resistance Tc(Tc^(Zero)), Jc at 77k, and the interface reactions betwean the superconduction thick film and YSZ substrate were investigated. For the YBa₂Cu₃O_(7-x)/Ag composite thick films annealed at 980℃ and 1000℃ in flowing oxygen, Tc^(Zero) and Jc at 77k increased, and the normal state resistivity and the thickness of interface reaction layer decreased strongly with increasing Ag content. The drastic decrease in reaction layer thickness with Ag addition seemed to result from the prevention of interaction between the film and the substrate by liquid Ag which formed during high temperature annealing. SEM analysis showed that the grain size increased as Ag content increased from 7wt% to 24wt%. It seems that the liquid Ag in YBa₂Cu₃O_(7-x)/Ag composite thick films enhances the intergranular coupling of YBa₂Cu_O_(7-x)/Ag grains, which results in the favored sintering process at 980℃.