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1 : 2 Long-range ordering and defect mechanism of WO3-doped perovskite Ba(Mg1/3Ta2/3)O3

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Abstract

The nature of the B-site cation ordering and the associated defect process necessary to stabilize the ordered domains were investigated using the WO3-doped Ba〈Mg1/3Ta2/3〉O3 〈BMT〉 system as a typical example of Ba〈B′1/3B″2/3〉O3-type complex perovskites. It was shown that only the 1 : 2 long-range ordering of the B-site cation existed in both undoped and WO3-doped BMT perovskites. The atomic defect mechanism associated with the stoichiometric 1 : 2 long-range ordering was systematically investigated. It is concluded that the substitution of W6+ for Ta5+ in the WO3-doped BMT enhances the degree of the 1 : 2 long-range ordering and produces the positively charged W ⋅Ta sites with a concomitant generation of tantalum vacancies 〈VTa″″′〉 and mobile oxygen vacancies 〈V⋅⋅ O〉 for the ionic charge compensation.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, and Laboratory for Physics/Chemistry of Dielectric Materials, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, South Korea

    Young K. Kim & Kyu-Mann Lee

  2. Department of Materials Science and Engineering, and Laboratory for Physics/Chemistry of Dielectric Materials, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, South Korea

    Hyun M. Jang

Authors
  1. Young K. Kim
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  2. Kyu-Mann Lee
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  3. Hyun M. Jang
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Kim, Y.K., Lee, KM. & Jang, H.M. 1 : 2 Long-range ordering and defect mechanism of WO3-doped perovskite Ba(Mg1/3Ta2/3)O3. Journal of Materials Science 35, 4885–4893 (2000). https://doi.org/10.1023/A:1004861821045

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