Relationship between growth rate and undercooling in Pt-added Y_1Ba_2Cu_3O_7−x
Relationship between growth rate and undercooling in Pt-added Y_1Ba_2Cu_3O_7−x
复制标题
添加 Pt 的 Y_1Ba_2Cu_3O_7−x 生长速率与过冷度的关系
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
Y. Shiohara
中科院分区：
文献类型：
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作者：
A. Endo;H. S. Chauhan;Yuichi Nakamura;Y. Shiohara
为了研究Y_1Ba_2Cu_30_7−x （Y123）晶体生长速率(R)与过冷度（ΔT）之间的关系，采用恒过冷凝固和连续冷却两种不同的方法生长Y_1Ba_2Cu_30_7−x （Y123）晶体。Y123晶体由{100}面和{001}面组成，具有锋利的切面界面，从种子外延生长。结果表明，{100}面（Ra）和{001}面（Rc）的生长率随ΔT的增加呈增加趋势，且在这些实验条件下，Rc的生长率比Ra快，ΔT < 20 K。R与ΔT之间的关系遵循抛物线方程，即{100}和{001}面的Ra∝ΔT^ 1.9和Rc∝ΔT^1.3。利用恒过冷法得到的R和ΔT关系模拟的晶粒尺寸与连续冷却的实验数据吻合较好。
Y_1Ba_2Cu_30_7− x (Y123) crystals were grown by two different methods, the constant undercooling solidification and the continual cooling method, with top seeding by Sm123 seed crystals in order to investigate a relationship between undercooling ( ΔT ) and a growth rate (R). The crystals of Y123 with a sharp faceted interface, which consisted of {100} and {001} faces, grew epitaxially from the seed. It was found that the growth rates of {100} face (Ra) and that of {001} face (Rc) showed an increasing trend with increasing ΔT , and Rc was faster than Ra within these experimental conditions, ΔT < 20 K. The relation between R and ΔT follows the parabolic equation, viz. Ra ∝ ΔT ^1.9 and Rc ∝ ΔT^1.3 for {100} and {001} faces, respectively. The simulated crystal size using the R and ΔT relations obtained from the constant undercooling method showed good agreement with experimental data by the continual cooling.