[12a-A201-1~8] 15.1 Bulk crystal growth

[12a-A201-5] Partitioning of Cr ion during growth of Cr:LiNbO₃ under a strong interface electric field

〇Satoshi Uda¹, Keiya Sato¹ (1.IMR, Tohoku Univ.)

Keywords:LiNbO3, solute partitioning, interface electric field

An interface electric field influences the partitioning of ionic species in the oxide melt during growth. Partitioning of Cr during growth of Cr:LiNbO₃ via a µ-PD method was observed under a large temperature gradient near the interface. A large temperature gradient arouses the Seebeck-effect-driven electric field. Cr ions were driven away from the interface due to the interface electric field whose effect on the transportation of Cr ion was larger than the moving interface velocity. However, Cr ions were observed to enter the crystal. This is probably because the large negative potential field with an atomic scale was present in the melt near the interface to conserve the electron flux density at the interface, which adsorbed Cr ions and they may have entered into the crystal with the progress of growth.