Effects of fluorine–oxygen substitution on the dielectric and electromechanical properties of lead zirconate titanate ceramics

In this study, a fluorine–oxygen substitution in lead zirconate titanate (PZT) ceramics with a nominal composition of Pb0.89(Ba, Sr)0.11(Zr0.52Ti0.48)O3 (PZT) doped with 1% MgO is proposed. The evolution of four dielectric and electromechanical coefficients—εr, tgδ, d33, and Qm—with increasing fluor...

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Veröffentlicht in:Journal of applied physics 1999-11, Vol.86 (10), p.5747-5752
Hauptverfasser: Guiffard, B., Audigier, D., Lebrun, L., Troccaz, M., Pleska, E.
Format: Artikel
Sprache:eng
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Zusammenfassung:In this study, a fluorine–oxygen substitution in lead zirconate titanate (PZT) ceramics with a nominal composition of Pb0.89(Ba, Sr)0.11(Zr0.52Ti0.48)O3 (PZT) doped with 1% MgO is proposed. The evolution of four dielectric and electromechanical coefficients—εr, tgδ, d33, and Qm—with increasing fluorine concentration showed that (MgO and F)-doped PZT ceramics are harder than only MgO-doped PZT (0 at. % F). The influence of the F–O substitution on the temperature dependence of the frequency constant N33 and the stress dependence of the piezoelectric coefficient d33 was investigated. A hysteretic free response of N33 and the lowest stress dependence of d33 were obtained for the (MgO and 4 at. % F)-doped PZT specimen. This material also exhibits the highest Qm in the (MgO and F)-doped PZT family and seems to be stoichiometric and without oxygen vacancies. For comparison, both the temperature and stress dependences of two commercial PZT ceramics are shown. The study of the influence of the Zr/Ti ratio on the temperature dependence of N33 revealed that fluorine stabilizes the rhombohedral phase/tetragonal phase interface. Both types of stability, versus temperature and uniaxial mechanical stress, may be linked to the domain wall configuration stabilization by Mg2+–F− dipoles which are less mobile than Mg2+–VO ones.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.371588