We grew stoichiometric LiNbO_3 single crystals by the TSSG method from a stoichiometric melt with the Li/Nb ratio of 1.0, to which 7wt% K_2O was added as flux. In the case of growth along the z axis, as-grown crystals were spontaneously poled. The polarization direction was independent of seed composition and polarization direction of seeds.
