MgO-doped near-stoichiometric lithium tantalate(SLT) crystal has been grown by adding flux.The Curie temperature of the grown crystal is 684±1 ℃.The crystal wafer with 1.8 mm thickness has been polarized with single pulse at room temperature and fully inversed domain structure is obtained.Chemical etching method is used to investigate the new domain nucleation,movement and coalescence process.The results indicate the movement of the inverted domain is not in uniform velocity during room temperat...