Lattice Distortion and Ferroelectric Properties in Pb-Substituted SrBi2Ta2O9.

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  • Pb置換SrBi<sub>2</sub>Ta<sub>2</sub>O<sub>9</sub>の格子ひずみと強誘電特性

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Abstract

The Rietveld analysis of powder X-ray and neutron diffraction for SBT and PbxSr1-xBi2Ta2O9 revealed that Pb ions were substituted at the perovskite A-site, and the disordering of Pb and Bi ions in Bi2O2 layers was not confirmed. The pure solid solutions with the SBT structure were obtained for the samples with x≤0.6, and the unit cell volume slightly increased by Pb substitution. With increasing Pb content (x), parameter c grew while a-b plane was reduced in spite of larger ionic radius of Pb2+ than Sr2+. These structure changes resulted in a higher Tc for Pb-SBT. Polarization hysteresis measurements using dense ceramics revealed that Ec increased with x while 2Pr at 250kV/cm practically remained constant at around 14μC/cm2. The incorporation of Pb into SBT resulted in a higher tilt angle of TaO6 octahedra along the a-axis (αx), which is partly responsible for the higher Ec observed for Pb-SBT.

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