کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1819961 | 1525771 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In situ observation and analysis of faceted crystal growth process in REBCO superconductive oxide
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
To clarify the nucleation and growth process of 123 crystals, growth of faceted RE123 (REBa2Cu3O7âX, RE = Nd, Sm, Gd, Y) crystals was observed in situ on MgO(1 0 0) by using high temperature optical microscope with zoom lens. RE123 crystals nucleated and grew at each undercooling (ÎT = 13-50 K). Growth rate (u) and incubation time (tinc) for nucleation were obtained from the relationship between the position of faceted interface and time (t). u increased with increasing ÎTr2, where ÎTr = ÎT/Tp, Tp was peritectic temperature. Nucleation rate (Iv) was obtained from the relationship between the number of nucleated crystals (n) and time. Iv increased with increasing of exp(-B/ÎTr2), where B was a constant. Both u and Iv under a fixed ÎT increased with increasing Tp: u(Nd123) > u(Sm123) > u(Gd123) and Iv(Nd123) > Iv(Sm123) > Iv(Gd123) for Tp(Nd123) > Tp(Sm123) > Tp(Gd123) in Ar-1%O2 atmosphere.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volumes 463â465, 1 October 2007, Pages 330-334
Journal: Physica C: Superconductivity and its Applications - Volumes 463â465, 1 October 2007, Pages 330-334
نویسندگان
N. Mori, Y. Nakahara, K. Ogi, M. Mukaida,