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Electrical degradation and thermally stimulated depolarization current of Ho-doped BaTiO3 with excess BaO
- Issue Date
- Apr-2006
- Publisher
- JAPAN SOC APPLIED PHYSICS
- Keywords
- electrical degradation; thermally stimulated depolarization current (TSDC); BaTiO3; oxygen vacancy; holmium
- Citation
- JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, v.45, no.4A, pp.2662 - 2666
- Indexed
- SCIE
SCOPUS
- Journal Title
- JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
- Volume
- 45
- Number
- 4A
- Start Page
- 2662
- End Page
- 2666
- ISSN
- 0021-4922
- Abstract
- The electrical degradation and relaxation behaviors of Ho-doped BaTiO3 with excess BaO have been studied in terms of oxygen vacancy concentration, leakage current, microstructure and thermally stimulated depolarization Current (TSDC). Within the solubility limit (similar to 3.0mol%), Ho3+ ions effectively increased the number of oxygen vacancies in Ba(Ti1-xHox)O3-0.5x. Leakage current increased with Ho content and the highest leakage current appeared in Ba(Ti0.98Ho0.02)O-2.99. The oxygen vacancy mobility in Ho-doped BaTiO3 specimens was significantly increased compared with that in undoped BaTiO3. The TSDC in Ba(Ti1-xHox)O3-0.5x increased with Ho content and the highest TSDC peak occurred at the specimen with 2.0mol% Ho. The activation energies for depolarization current related to the motion of oxygen vacancies in Ba(Ti1-xHox)O3-0.5x were calculated to be 0.60-0.64eV.
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