Phase Transformation and Optimized Growth of TFA-MOD REBa_2Cu_3O_(7-x) Films for Coated Conductors  

作　　者：Zhi-Yong Liu Bo Gao Li-Liang Ying Feng Fan Yu-Ming Lu Chuan-Bing Cai T. Thersleff B. Elke 

机构地区：[1]Physics Department, Shanghai University, 200444, Shanghai, China [2]IFW Dresden, P.O. Box 270116,D-01171 Dresden, Germany

出　　处：《Journal of Electronic Science and Technology of China》2008年第2期147-151,共5页中国电子科技（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China under Grant No. 50672057, 50702033 and 10774098;the National Science Foundation of China (973 Projects) under Grant No. 2006CB601005;the Science and Technology Commission of Shanghai Municipality under Grant No. 0752nm017;the Project Based Personnel Exchange Program between China and Germany under Grant No. [2006] 3139.

摘　　要：Several types of REBa2Cu3O7-x （REBCO, RE=Y, Ho etc.） films are prepared on single crystal substrate LaAIO3 by TFA-MOD method. The phase transformation and optimized growth conditions in the crystallization are studied. Compared with SmBCO and GdBCO, high quality YBCO and HoBCO films are relatively easy to produce. It is revealed that the YBCO grains can form at low temperatures such as 730 ℃ during the initial heating ramp. With a high heating rate of 20 K/min and a low oxygen pressure of 100 ppm, the optimum growth temperature is around 780℃, at which the films show a Jc value of 2.88 MMcm2. Further decrease of the heating rate may produce the highquality YBCO Film with a higher Jc of 3.65 MA/cm2. The temperature dependence of resistances in various magnetic fields up to 9 T shows that the present TFAMOD YBCO and HoBCO films have similar superonducting transition temperature and magnetotransport properties.Several types of REBa2Cu3O7-x （REBCO, RE=Y, Ho etc.） films are prepared on single crystal substrate LaAIO3 by TFA-MOD method. The phase transformation and optimized growth conditions in the crystallization are studied. Compared with SmBCO and GdBCO, high quality YBCO and HoBCO films are relatively easy to produce. It is revealed that the YBCO grains can form at low temperatures such as 730 ℃ during the initial heating ramp. With a high heating rate of 20 K/min and a low oxygen pressure of 100 ppm, the optimum growth temperature is around 780℃, at which the films show a Jc value of 2.88 MMcm2. Further decrease of the heating rate may produce the highquality YBCO Film with a higher Jc of 3.65 MA/cm2. The temperature dependence of resistances in various magnetic fields up to 9 T shows that the present TFAMOD YBCO and HoBCO films have similar superonducting transition temperature and magnetotransport properties.

关 键 词：Coated conductor REBCO films TFA-MOD. 

分 类 号：TM2[一般工业技术—材料科学与工程]