F-center mechanism of long-term relaxation in lead zirconate-titanate-based piezoelectric ceramics. 1. After-heating relaxation

Results of experimental investigation of relaxation aging processes in Pb(Zr,Ti)O3-based solid solutions after termination of external actions are presented. Heating, DC electric field, uniaxial pressure and some of their combinations were taken as external actions. In the main part of the present p...

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Bibliographic Details
Published in:Journal of advanced dielectrics 2015-12, Vol.5 (4), p.1550036-1550036-9
Main Authors: Ishchuk, V. M., Kuzenko, D. V.
Format: Article
Language:English
Subjects:
after-heating process
Dependence
dielectric constant
Dielectric relaxation
Direct current
Electric fields
External pressure
F-center
Heating
Lead zirconate titanates
long-term relaxation
Oxygen
Piezoelectric
Piezoelectric ceramics
Piezoelectricity
Solid solutions
Vacancies
Zirconium
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Summary:Results of experimental investigation of relaxation aging processes in Pb(Zr,Ti)O3-based solid solutions after termination of external actions are presented. Heating, DC electric field, uniaxial pressure and some of their combinations were taken as external actions. In the main part of the present paper, we use heating as external action. The said processes are long-time one and are described by the logarithmic function of time. Reversible and nonreversible relaxation processes take place depending on the action intensity. The relaxation rate depends on the action intensity also, and the said dependence has nonlinear and nonmonotonic form if external action leads to domain disordering. The oxygen vacancies-based model for description of the long-time relaxation processes is suggested. The model takes into account oxygen vacancies on the sample’s surface ends, their conversion into F + - and F 0 -centers under external effects (due to the liberation of the pyroelectric charge) and subsequent relaxation of these centers into the simple oxygen vacancies after the actions termination. The initial sample’s state is electroneutrality one. F-center formation leads to the violation of the original sample’s electroneutrality, and generates DC electric field into the sample. Relaxation of F-centers is accompanied by decreasing of electric field, induced by them, and dielectric constant relaxation as consequent effect.
ISSN:2010-135X
2010-1368
DOI:10.1142/S2010135X15500368