Interface field-modified solute partitioning during Mn: LiNbO₃ crystal fiber growth by micro-pulling down method II radial distribution analysis

The influence of an interface electric field on the solute partitioning during LiNbO₃ single crystal fiber by micro-pulling-down method has been studied. Thermoelectric power was a dominant cause of the electric field, and the Seebeck-effect-induced electric field was measured in the solid near the interface along the axial as well as radial directions. Solute partitioning was subject to these interface field effects. Mn was rich in the core of the Mn-doped LiNbO₃ crystal fiber of small diameter, which was two dimensionally analyzed to predict the redistribution of the ionic solute by an interface electric field. The inversion of the radial temperature gradient in the molten zone was specific to the micro-pulling-down method and suppressed the radial thermoelectric power in the liquid, which consequently led to the rather homogeneous radial solute distribution in the solid.