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Formation and microwave dielectric properties of Sr(Ga0.5Ta0.5)O3-based complex perovskites

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Abstract

The Sr(Ga0.5Ta0.5)O3-based perovskites with O2- and/or Sr2+ vacancies were formed by changing the A-site and/or B-site cation ratios. The Sr-deficient perovskites with a limited composition of Sr0.86(Ga0.36Ta0.64)O3 could be obtained, whereas oxygen vacancies were hardly created. The B′-site Ga3+ cation could be replaced with large Sc3+, In3+, Y3+, Nd3+ and La3+. The crystal symmetry of the complex perovskites changed from cubic (B′=Ga3+, Sc3+, In3+) to tetragonal (B′=La3+) through rhombohedral (B′=Y3+, Nd3+). The dielectric permittivities of these ceramics indicated no distinct dependence on the B′-site cation species. The temperature coefficient of permittivity might be associated with the symmetry change of the perovskite phases. Higher microwave Qf values, >Qf=38 000 GHz, were obtained for our complex perovskite ceramics, except with B′=La3+.

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-ku Sapporo, 060, Japan

    J TAKAHASHI, T FUJII, T YAMADA & K KODAIRA

  2. R&D Division, Sumitomo Special Metals Co. Ltd, Shimamoto, Mishima Osaka, 618, Japan

    K KAGEYAMA

Authors
  1. J TAKAHASHI
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  2. K KAGEYAMA
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  3. T FUJII
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  4. T YAMADA
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  5. K KODAIRA
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TAKAHASHI, J., KAGEYAMA, K., FUJII, T. et al. Formation and microwave dielectric properties of Sr(Ga0.5Ta0.5)O3-based complex perovskites. Journal of Materials Science: Materials in Electronics 8, 79–84 (1997). https://doi.org/10.1023/A:1018513222864

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