Cation-vacancy-induced low coercive field in La-modified SrBi2Ta2O9
作者： Yuji Noguchi , Masaru Miyayama , Kenichi Oikawa , Takashi Kamiyama
DOI: 10.1063/1.1667600
关键词: Materials science 、 Tilt (optics) 、 Polarization (electrochemistry) 、 Perovskite (structure) 、 Ferroelectricity 、 Rietveld refinement 、 Coercivity 、 Neutron diffraction 、 Vacancy defect 、 Crystallography
摘要: We studied the effects of La modification on crystal structure and ferroelectric polarization properties SrBi2Ta2O9 (SBT). The Rietveld refinement neutron powder diffraction demonstrated that La3+ substitution, preferentially at Sr2+ site (perovskite A site), resulted in A-site vacancies for charge compensation. Polarization measurements revealed led to a much lower coercive field larger remanent polarization. tilt angle TaO6 octahedra from c axis remained constant, but decreased along direction (the component axis). results Ca-, Ba-, Pb-substituted SBT, as well La-modified indicated octahedral is closely related SBT system.
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