Pb(Zr0.525Ti0.475)O3 piezoceramics, both unmodified and doped with 2 wt% Bi2O3 or Nb2O5, were prepared by the usual techniques, using sintering temperatures from 900° to 1250°C. The microstructural data showed that the sintering temperature which produces minimum porosity is altered by the oxide additions. X‐ray diffraction demonstrated the coexistence of both ferroelectric phases. The lattice parameter measurements showed that the tetragonal and rhombohedra1 unit cells of the two ferroelectric phases depend on the sintering temperature.
Investigations by X-ray diffraction of unmodified Pb(Zro.53Ti0.47)O3 solid solutions obtained a t sintering temperatures between 900 and 1200 "C ascertain the simultaneous occurrence of both ferroelectric FT and F, phases at MPB. Lattice parameter measurements show that UT increases and c~ decreases with increasing sintering temperature, whereas the rhombohedra1 unit cell is only slightly modified. A simple mechanism, based on microcompositional fluctuations, is suggested to explain the phase coexistence in the MPB region, as well as the dependence of lattice parameters on the sintering temperature.Les investigations par diffraction de rayons X d'une solution solide de Pb(Zro,53Ti0,47)O3, sans additions, obtenue & des temperatures de frittage entre 900 e t 1200 "C, ont mis en 6vidence la pr6sence simultanee des deux phases ferro-6lectriques FT et FR a la frontikre de phase morphotropique. Les mesures des parametres de r6seau ont montrk que UT croit tandis que CT dkcroit lors de 1'616vation de la tcmpkrature de frittage, pendant que la cellule elementaire rhomboedrique n'est que faiblement affectke. On suggbre un mifcanisme simple, bas6 sur des fluctuations de microcomposition, pour l'explication de la coexistence de phase dans la region de la frontiere morphotropique et de la variation avec la tempkrature de frittage des parametres de r6seau associks & ces deux phases.
Mikrostrukturuntersuchungen an unmodifizierten und mit 2 Gew.‐% Bi2O3 und NbzOs dotierten Pb(Zr0‐525Tio‐475)O3‐Piezokeramiken, die bei unterschiedlichen Temp. im Bereich 900‐ 1250°C gesintert wurden, zeigen, daß die Porosität bei einer optimalen Sintertemp.
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