کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9841591 1525794 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-Ic processing for YBCO coated conductors by TFA-MOD process
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
High-Ic processing for YBCO coated conductors by TFA-MOD process
چکیده انگلیسی
YBCO films were fabricated on PLD-CeO2/IBAD-Gd2Zr2 O7/Hastelloy substrates using the TFA-MOD process. In order to obtain higher Ic performance, the thicker films maintaining high-Jc values are required. Jc depended strongly on the PH2O during the crystallization in the process. The pore size was smaller in the high-Jc films crystallized under the medium PH2O condition and became larger in the low-Jc films under both lower and higher PH2O for the YBCO films with a constant thickness. Furthermore, crack generation was observed in thick films crystallized at the high PH2O condition. Consequently, both pore and crack formations limit the Jc properties since large pore causes local reduction of current paths and additionally results in local concentration of electric fields. Jc also depended strongly on the YBCO crystal grain alignment which is affected by in-plane grain alignment of the buffered substrate. Then, the effect of in-plane grain alignment of the CeO2 cap layer on Jc was investigated for thicker YBCO films. As a result, the Jc value increased with improvement of the crystal alignment of the CeO2 cap layers. Finally, a YBCO film with a high-Ic value of 413 A at 77 K in self-field was achieved in a film fabricated on Δϕ = 4° of the CeO2 layer using the appropriate crystallization conditions for crack-free film.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volumes 426–431, Part 2, 1 October 2005, Pages 959-965
نویسندگان
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