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Mechanical Reinforcement and Piezoelectric Properties of PZT Ceramics Embedded with Nano-Crystalline
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The double-scale lead zirconate titanate (PZT) piezoelectric ceramics were prepared by the solid state processing with PZT nano-crystalline and micro-powder. The microstructures, electrical and mechanical properties of the double-scale PZT are investigated. All the sintered ceramics exhibit a single perovskite structure and the grain size of the dou ble-scale PZT reduces due to the incorporation of PZT nano-crystalline. Compared to normal PZT, the mechanical properties increase significantly and the piezoelectric properties decrease slightly. Mechanisms responsible for the reinforcement of the double-scale PZT are discussed. 相似文献
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Structural and electrical properties of Nd ion modified lead zirconate titanate nanopowders and ceramics
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A modified sol-gel method is used for synthesizing Nd ion doped
lead zirconate titanate nanopowders Pb1 - 3x/2NdxZr0.52Ti0.48O3 (PNZT) in an ethylene
glycol system with zirconium nitrate as zirconium source. The
results show that it is critical to add lead acetate after the
reaction of zirconium nitrate with tetrabutyl titanate in the
ethylene glycol system for preparing PNZT with an exact fraction of
titanium content. It has been observed that the dopant of excess Nd
ions can effectively improve the sintered densification and activity
of the PNZT ceramics. Piezoelectric, dielectric and ferroelectric
properties of the PNZT ceramics are remarkably enhanced as compared
with those of monolithic lead zirconate titanate (PZT).
Especially, the supreme values of piezoelectric constant (d33)
and dielectric constant (\it ε) for the PNZT are both
about two times that of the monolithic PZT and moreover, the remnant
polarization (Pr) also increases by 30%. According to
the analysis of the structures and properties, we attribute the
improvement in electrical properties to the lead vacancies caused by
the doping of Nd ions. 相似文献
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