Abstract
Abstract The influence of the sintering temperature on the structure and on the hysteresis loops of Fe3+ doped Pb(ZrxTi1-x)O3 system has been investigated. Three compositions have been selected in the following mode: one in rhombohedral region, one in MPB region and one in tetragonal region have been obtained by solid state reaction technique. Sintering has been carried out at 12000C and 12500C respectively. The nature of the phases has been investigated in detail using X-ray diffraction analysis (XRD). All the sintered samples reveal a perovskite type structure. The surfaces have been lapped and metalized in order to obtaine the hysteresis loops at room temperature. The results showed a similar behaviour with “hard” PZT ceramics.
Highlights
Doped Pb(ZrxTi1-x)O3 (PZT) ceramics due to their piezoelectric properties show a very large interest for applications such as sensors [1], actuators [2], transducers [3] and structural health monitoring [4]
As the sintering temperature increases to 1250°C the density of all samples increases and the results seems to be dependent of the composition
It can be observed that the values obtained for the remanent polarization Pr and the coercitive field Ec increases with increasing of the sintering temperature for the PZT-Fe1 and PZT-Fe2 and decreases with increasing of the sintering temperature for the PZT-Fe3 [16]
Summary
Doped Pb(ZrxTi1-x)O3 (PZT) ceramics due to their piezoelectric properties show a very large interest for applications such as sensors [1], actuators [2], transducers [3] and structural health monitoring [4]. The final piezoelectric properties depend on the: (i) value of Zr4+/Ti4+ ratio, (ii) nature of dopants and (iii) doping into A2+ or/and B4+ site of AIIBIVO3 perovskit structure. The piezoelectric properties of doped PZT ceramics can be significantly modified by the addition of a small quantities of dopants. The oxygen vacancies lead to realization of complex defects that have an electrical dipole moment. These defects can be re-oriented by spontaneous polarization [8]. Addition of Fe3+ in the PZT structure form defect dipoles with partially charge-compensating oxygen vacancies (Fe′ Zr,Ti− VO) if the doping level is below his solubility limit [12]
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