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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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| Authors: | Young K Kim Kyu-Mann Lee and Hyun M Jang |
| Affiliation: | (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;(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 |
| 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 BaB 1/3B 2/3O3-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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