Physics – Condensed Matter – Materials Science
Scientific paper
2009-12-17
Physical Review B 80, 224109 (2009)
Physics
Condensed Matter
Materials Science
theory and experiment, 22 pages, 3 figures
Scientific paper
10.1103/PhysRevB.80.224109
Migration of charged point defects triggered by the local random depolarization field is shown to plausibly explain aging of poled ferroelectric ceramics providing reasonable time and acceptor concentration dependences of the emerging internal bias field. The theory is based on the evaluation of the energy of the local depolarization field caused by mismatch of the polarizations of neighbor grains. The kinetics of charge migration assumes presence of mobile oxygen vacancies in the material due to the intentional or unintentional acceptor doping. Satisfactory agreement of the theory with experiment on the Fe-doped lead zirconate titanate is demonstrated.
Genenko Yu. A.
Glaum J.
Granzow T.
Hirsch O.
Hoffmann M. J.
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