A time-resolved x-ray diffraction (XRD) experiment at using a synchrotron radiation source was carried out during the containerless solidification of ( and Lu) in order to identify the metastable phase in situ. The metastable phase solidified primarily from the undercooled melt finally transformed to the stable orthorhombic phase during the short period of recalescence . Although the metastable phase could not be detected in the as-solidified sample by the powder XRD, the in situ diffraction pattern of the metastable phase in the system was consistent with that of the metastable hexagonal phase.
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