用垂直布里奇曼法生长三元BaFe $_2$ As $_2$相的单晶
Single-crystal growth of the ternary BaFe$_2$As$_2$ phase using the vertical Bridgman technique
摘要：
研究了Ba-Fe-As三元系BaFe $_2$ As $_2$相的初生凝固场。我们发现，BaFe $_2$ As $_2$相最有可能在FeAs过量或Ba $_{x}$ As $_{100-x}$过量液体中同成分熔化并主要凝固。在已知初始凝固场的情况下，我们使用Ba $_{15}$ Fe $_{42.5}$ As $_{42.5}$的起始液体成分进行了垂直Bridgman生长。获得了典型尺寸为10 × 4 × 2 mm $^3$的大单晶，并通过X射线劳厄和中子衍射证实了它们的质量。
英文摘要：
Ternary Ba-Fe-As system has been studied to determine a primary solidification field of the BaFe$_2$As$_2$ phase. We found that the BaFe$_2$As$_2$ phase most likely melts congruently and primarily solidifies either in the FeAs excess or Ba$_{x}$As$_{100-x}$ excess liquid. Knowing the primary solidification field, we have performed the vertical Bridgman growth using the starting liquid composition of Ba$_{15}$Fe$_{42.5}$As$_{42.5}$. Large single crystals of the typical size 10x4x2 mm$^3$ were obtained and their quality was confirmed by X-ray Laue and neutron diffraction.
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