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首页> 外文期刊>The European physical journal: Special topics >Magnetic field controlled floating-zone single crystal growth of intermetallic compounds(Review)
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Magnetic field controlled floating-zone single crystal growth of intermetallic compounds(Review)

机译：金属间化合物的磁场控制浮区单晶生长（综述）

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Radio-frequency (RF) floating zone single crystal growth is an important technique for the preparation of single bulk crystals. The advantage of the floating-zone method is the crucible-free growth of single crystals of reactive materials with high melting points. The strong heat diffusion on the surface, as well as the melt convection in the molten zone due to induction heating, often leads to an undesired solid-liquid interface geometry with a concave (towards the solid phase) outer rim. These concave parts aggravate the single crystal growth over the full cross-section. A two-phase stirrer was developed at IFW Dresden in order to avoid the problems connected with these concave parts. It acts as a magnetic field pump and changes the typical double vortex structure to a single roll structure, thus pushing hot melt into the regions where the concave parts may arise. The current in the secondary coil is induced by the primary coil, and the capacitor and the resistance of the secondary circuit are adjusted to get a stable 90 degree phase-shift between the coil currents. Single crystal growth of industrial relevant RuAl and TiAl intermetallic compounds was performed based on the material parameters and using the adjusted two-phase stirrer. Very recently, the magnetic system was applied to the crystal growth of biocompatible TiNb alloys and antiferromagnetic Heusler MnSi compounds.
机译：射频（RF）浮区单晶生长是制备单块体晶体的重要技术。浮区法的优点是具有高熔点的反应材料单晶的无坩埚生长。由于感应加热，表面上的强烈热扩散以及熔融区中的熔体对流通常会导致不希望的固-液界面几何形状具有凹入（朝向固相）的外缘。这些凹入部分加剧了单晶在整个横截面上的生长。为了避免与这些凹入部件有关的问题，德累斯顿国际粮食基金会开发了一种两相搅拌器。它起着磁场泵的作用，将典型的双涡旋结构改变为单辊结构，从而将热熔胶推入可能出现凹入部分的区域。次级线圈中的电流由初级线圈感应，并调节电容器和次级电路的电阻，以在线圈电流之间获得稳定的90度相移。根据材料参数并使用调整后的两相搅拌器，进行工业相关的RuAl和TiAl金属间化合物的单晶生长。最近，磁性系统被应用于生物相容性TiNb合金和反铁磁Heusler MnSi化合物的晶体生长。

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