Abstract
Crystal structures and ferroelectric properties of SrBi2Ta2O9, which is used for FeRAM, 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. Crystal structures and ferroelectric properties of an A-site substitution system, (Ca, Sr, Ba)Bi2Ta2O9, and a B-site substitution system, SrBi2(Ta, Nb)2O9, are also reported. Degradation of SrBi2Ta2O9 under reducing conditions is investigated and the degradation mechanism is discussed from a structural point of view.
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