کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1820474 | 1525782 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Trajectory-property relationships in MOD-derived YBCO films
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
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چکیده انگلیسی
A study of the physical and chemical changes during processing in MOD-derived YBCO films was performed. Fully processed films were 70-85% of theoretical density. The sintering rate increased substantially in the compositional range F/Ba = 1.8-1.5. The activation energy for sintering decreased above a P(H2O) dependent threshold temperature. XRD indicated this temperature/composition threshold also corresponded to YBCO nucleation, suggesting ex situ YBCO forms in contact with a melt. The ramp rate and P(H2O) were used to control F/Ba trajectories, which were correlated to performance. The nucleation of YBCO was strongly dependent on processing conditions. Nucleation temperature was varied by at least 60 °C in the study. The optimal YBCO nucleation temperature in the 300-800 nm films was around 725 °C. a-axis grains dominated the microstructures of films where YBCO nucleated at <700 °C. Large second phases, but no a-axis grains, were found when the nucleation temperature was >750 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volume 450, Issues 1â2, 15 December 2006, Pages 76-82
Journal: Physica C: Superconductivity and its Applications - Volume 450, Issues 1â2, 15 December 2006, Pages 76-82
نویسندگان
D.E. Wesolowski, M. Yoshizumi, M.J. Cima,