10:15 〜 10:30 ▲ [20a-W833-4] Electric Field Effect of Relaxor Ferroelectric 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 Single Crystals Studied by Micro-Brillouin Scattering 〇(D)Aftabuzzaman Md1、Kojima Seiji1 (1.Univ. Tsukuba)