Crystal structures and ferroelectric properties of oxide-ferroelectric materials used for FeRAMs

摘要

Crystal structures and ferroelectric properties of Bi-layered oxides, which are used for FeRAMs, are reported. Structure analysis using neutron diffraction data reveals significant distortion of the structure. The pronounced structural distortion of the perovskite-type unit leads to larger ferroelectric polarization and higher Curie temperature. A problem of the material against reducing conditions is also pointed out from a structural point of view.