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Drastic Decrease in Viscosity of Molten LiNbO3 under Non-Oxygen Atmosphere

The viscosity of undoped and MgO-doped LiNbO3 was measured by the oscillation damping method under non-oxygen atmosphere. The obtained viscosity values of undoped LiNbO3 were not much different from those of MgO-doped LiNbO3, but considerably smaller (1/2-1/4) than the previously reported values, which were measured in air. This drastic decrease was attributed to non-oxygen atmosphere. It was pointed out that the uniform dispersion of the dopant and the uniform liquid structure were easily realized under non-oxygen atmosphere.