Abstract
The influence of dopant concentration on PZT (54/46) systems doped with lanthanum and/or niobium is studied. The sintering kinetics is presented for 1 wt% of the dopant used to find the main mechanism which drives this process. The results were compared with a phenomenological model for viscous sintering and solid state sintering. The exponent obtained for viscous sintering in PZTN, PLZT and PLZTN were 0.05, 0.01, and 0.23 respectively, which indicate that the process is reactive liquid in all cases. In the other hand, the exponent obtained for solid state sintering were 6.61, 5.68, and 1.23 respectively, and prevalence Ost-wald ripening and coalescence process together. Both dopants inhibit the grain growth and accelerate the sintering process, which increases with dopant concentration and the combination of both dopants. Shoro-hod-Olevsky model was applied for explain grain growth evolution, but does not coincide strictly with the applied model, which suggest that the process is very complex.
Highlights
IntroductionBecause doped PZT (54/46) piezoceramics are polycrystalline, their microstructural characteristics (grain size and orientation distribution, phase distribution, phase and domain morphology) as well as their defects (atomic structures of domain walls, native defects, impurities) play crucial roles in determining their properties [1]
Because doped PZT (54/46) piezoceramics are polycrystalline, their microstructural characteristics as well as their defects play crucial roles in determining their properties [1]
The exponent obtained for viscous sintering in PZTN, PLZT and Pb1-3x/2LaxVPbx/2 (Zr0.54Ti0.46) 1-5y/4NyVZrTiy/4O3 (PLZTN) were 0.05, 0.01, and 0.23 respectively, which indicate that the process is reactive liquid in all cases
Summary
Because doped PZT (54/46) piezoceramics are polycrystalline, their microstructural characteristics (grain size and orientation distribution, phase distribution, phase and domain morphology) as well as their defects (atomic structures of domain walls, native defects, impurities) play crucial roles in determining their properties [1]. The local densification effect [2] is one of the most important technological problems related to sintering, as a strong densification may occur in some parts of a porous body while large pores appear in others. This shows the instability caused by initially-small heterogeneities in the spatial distribution of pores, and may lead to various microstructural defects nucleation producing macroscopic lattice and damage. The influence of dopant concentration on the densification process during sintering is studied
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