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- W1623453054 abstract "We studied the effects of La modification on the crystal structure and the ferroelectric polarization properties of SrBi2Ta2O9 (SBT). The Rietveld refinement of neutron powder diffraction demonstrated that La3+ substitution, preferentially at the Sr2+ site (perovskite A site), resulted in A-site vacancies for charge compensation. Polarization measurements revealed that La modification led to a much lower coercive field and a larger remanent polarization. The tilt angle of the TaO6 octahedra from the c axis remained constant, but La modification decreased the tilt angle along the polarization direction (the component along the a axis). The results for Ca-, Ba-, and Pb-substituted SBT, as well as La-modified SBT, indicated that the TaO6 octahedral tilt along the a axis is closely related to coercive field for the SBT system." @default.
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- W1623453054 date "2004-04-15" @default.
- W1623453054 modified "2023-09-27" @default.
- W1623453054 title "Cation-vacancy-induced low coercive field in La-modified SrBi2Ta2O9" @default.
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- W1623453054 doi "https://doi.org/10.1063/1.1667600" @default.
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