Proceedings of the Korea Association of Crystal Growth Conference (한국결정성장학회:학술대회논문집)

The Korea Association of Crystal Growth (한국결정성장학회)
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Preparation and characterization of new perovskite compounds $(Na_{0.5}Sr_{0.5})(M_{0.5}N_{0.5})O_3$(MTi,Zr N=Ta,Nb)

  • Chung, Hoon-Taek (Research Laboratory of Engineering Materials) ;
  • Tetsuro Nakamura (Research Laboratory of Engineering Materials, Tokyo Institute of Technology) ;
  • Mitsuru Itoh (Research Laboratory of Engineering Materials, Tokyo Institute of Technology)
  • Published : 1997.06.01
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Abstract

New complex perovskite compounds (Na0.5Sr0.5)(Ti0.5Nb0.5)O3, (Na0.5Sr0.5)(Zr0.5Ti0.5)O3 and (Na0.5Sr0.5)(Ti0.5Ta0.5)O3 have been prepared. The crystal structures of these compounds were determined by powder X-ray Rietveld analysis. The crystal structure of (Na0.5Sr0.5)(Ti0.5Nb0.5)O3 and (Na0.5Sr0.5)(Zr0.5Ta0.5)O3 was Pmmn, and that of (Na0.5Sr0.5)(Ti0.5Nb0.5)O3 was I4/mmm. All these compounds showed the superstructure due to the oxygen octahedron distortion. The selected bond distances and bond angles were calculated by the OFFER. The octahedron distortion for each sample, which was measured from the bond distances and bond angles, showed the following order: (Na0.5Sr0.5)(Z0.5Ta0.5)O3> (Na0.5Sr0.5)(Ti0.5Nb0.5)O3 > (Na0.5Sr0.5)(Ti0.5Ta0.5)O3. Dielectric properties were measured for the samples. In this study, the crystal structure and dielectric properties of the new complex perovskite structures and discussed.

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