Spherical Nb single crystals containerlessly grown by electrostatic levitation

Sung, Y. S.; Takeya, H.; Hirata, K.; Togano, K.
May 2003
Applied Physics Letters;5/26/2003, Vol. 82 Issue 21, p3638
Academic Journal
Spherical Nb (T[sub m]= 2750 K) single crystals were grown via containerless electrostatic levitation (ESL). Samples became spherical at melting in levitation and undercooled typically 300-450 K prior to nucleation. As-processed samples were still spherical without any macroscopic shape change by solidification showing a uniform dendritic surface morphology. Crystallographic {111} planes exposed in equilateral triangular shapes on the surface by preferential macroetching and spotty back-reflection Laue patterns confirm the single crystal nature of the ESL-processed Nb samples. No hysteresis in magnetization between zero field and field cooling also implies a clean defect-free condition of the spherical Nb single crystals.


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