Journal
PHYSICAL REVIEW B
Volume 80, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.224109
Keywords
ageing; dielectric depolarisation; dielectric relaxation; doping profiles; ferroelectric ceramics; grain boundaries; impurity states; iron; lead compounds; space charge; vacancies (crystal); zirconium compounds
Funding
- Deutsche Forschungsgemeinschaft through the Collaborative Research Center [595]
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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.
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