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
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
In situ observation and analysis of faceted crystal growth process in REBCO superconductive oxide
چکیده انگلیسی
To clarify the nucleation and growth process of 123 crystals, growth of faceted RE123 (REBa2Cu3O7−X, 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 (ΔT = 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 ΔTr2, where ΔTr = ΔT/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/ΔTr2), where B was a constant. Both u and Iv under a fixed ΔT 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 463–465, 1 October 2007, Pages 330-334
نویسندگان
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