Structure Identification and Electrical Properties of the New Pyrochlore Phase in the Sr-Bi-Ta-Ti-O System

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概要

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• A new pyrochlore phase Sr_<0.5>BiTaTiO_<6.5> has been successfully synthesized via a solid state reaction, and its crystal structure and electrical properties are also investigated in this study. When the amount of TiO_2 added in the starting materials is insufficient, a secondary phase-SrBi_2Ta_2O_9 is formed with the pyrochlore phase ; however, when an ample amount of TiO_2 is added, some excess TiO_2 remains in the bulk. The structure refinement based on the Rietveld method corroborates the finding that sr_<0.5>BiTaTiO_<6.5> exhibits a cubic Fd3^^-m structure with a lattice constant a_0 = 10.424 Å, and the theoretical density is calculated to be 6.867 g/cm^3. The exact position of each atom in Sr_<0.5>BiTaTiO_<6.5> is determined, and the ideal crystal structure model is constructed. According to the dielectric measurement and polarization analysis, it is found that the densified Sr_<0.5>BiTaTiO_<6.5> exhibits paraelectric characteristics at room temperature with a low dielectric constant(94.8 at 10kHz). In addition, the dielectric constant of this pyrochlore phase shows a rather weak dependence upon temperature as well as frequency.

• 社団法人応用物理学会の論文
• 2000-09-30

著者

• Lu Chung-hsin

  Department Of Chemical Engineering National Taiwan University

• Wen Cheng-yen

  Department Of Chemical Engineering National Taiwan University

• FANG Bu-Kuan

  Department of Chemical Engineering, National Taiwan University

• Fang Bu-kuan

  Department Of Chemical Engineering National Taiwan University

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