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- Title
Oxygen Vacancy Relaxation and Domain Wall Hysteresis Motion in Cobalt-Doped Barium Titanate Ceramics.
- Authors
Bo Lin Cheng; Button, Tim W.; Gabbay, Maurice; Fantozzi, Gilbert; Maglione, Mario
- Abstract
Mechanical and dielectric loss measurements were carded out in the BaTiO3 ceramics doped with Co at frequencies between 0.01 Hz and 1 MHz as a function of temperature from -150° to 150°C. The relaxation peak observed in the ferroelectric phase with an activation energy of 0.27 eV is assumed to be related to the motion of oxygen vacancies. This peak could be because of the reorientation of an electrical dipole made of oxygen vacancies and Co3+ ions in the lattice. Furthermore, another loss peak located just below the Curie temperature T, could be interpreted as hysteretic motion of the domain walls in a regime where the domain wall density is changing.
- Subjects
CERAMICS; DIELECTRIC loss; DIELECTRIC measurements; TEMPERATURE; FERROELECTRIC crystals; IONS; OXYGEN
- Publication
Journal of the American Ceramic Society, 2005, Vol 88, Issue 4, p907
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2005.00167.x