L. Lebrun et al., Dielectric and piezoelectric properties of (La, Mg, F) and (Mg, Mn, F) doped PZT ceramics under low and high sollicitations, J EUR CERAM, 21(10-11), 2001, pp. 1357-1360
The hysteretic behavior of the charge coefficient d(33) under high mechanic
al stress and of frequency constant N-33 during the temperature cycle -40 d
egreesC- + 80 degreesC can be cancelled by fluorine oxygen substitution in
the lattice of Mg-doped PZT. These fluorine doped materials also exhibit a
high mechanical quality factor and low dielectric losses. The drawback is t
hat they have a lower d(33) coefficient and are difficult to pole. Mn dopin
g in B site or La doping in A site, in the ABO(3) type perovskite structure
are known to increase the d(33) coefficient and the poling ability. This r
esult is observed on (Mg, F) co-doped PZT with Mn and with La content of 1.
5 mol%. In the same manner, Mn doping enhances the hysteretic behavior and
the losses while La doping does not significally changes the (Mg, F) co-dop
ed PZT characteristics except the fluorine content for which the losses and
the hysteresis are the lowest. (C) 2001 Elsevier Science Ltd. All rights r
eserved.