CORE SHELL STRUCTURE IN PB(MG1/3NB2/3)O-3-PBTIO3/

Law-temperature hot-pressed Pb(Mg1/3Nb2/3)O-3 (PMN)-PbTiO3(PT) materia ls exhibited a small temperature dependence of dielectric constants. T he microstructure was studied by means of a transmission electron micr oscope (TEM). It was found that a core/shell structure with a pure PMN core and a PMN-PT shell was formed in the majority of grains. The sma ll temperature dependence of dielectric constants was attributed to th e existence of the core/shell structure. It was also found that the co re/shell structure was formed at the early stage of hot-pressing and t hat diffusion of Ti was suppressed under pressure once the material be came dense.