The addition of ZnO nanowhiskers (ZnOw) in lead zirconate titanate (PZT) matrices results in reinforced composite materials but deteriorates their electrical properties. In this study, novel piezoelectric PZT/ZnOw composites modified with Nb2O5 were successfully fabricated using solid-state sintering method. The experimental results showed that the addition of 0.5 wt% Nb2O5 resulted in highly dense and homogenous PZT composites after sintering at 1150°C, with good piezoelectric and ferroelectric properties similar to pure PZT, specifically piezoelectric constant d33=665 pC/N, electromechanical coupling factor kp=0.7, relative dielectric constant =5048, and remnant polarization Pr=30.2 C/cm2. The “soft effect” of Nb5+ ions, reflected in the improvement of the aforementioned properties, is attributed to the accommodation of Nb5+ ions at the B sites of the lattice of PZT. Compared with the PZT/ZnOw reinforced composites, the mechanical properties were slightly improved by adding 0.5 wt% Nb2O5, where flexural strength f of 128 MPa and fracture toughness KIC of 1.46 MPa·m1/2 were measured.
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Document Type: Research Article
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
School of Information Engineering, Central University for Nationalities, Beijing 100081, China
Department of Materials Science and Engineering, University of Ioannina, GR-451 10 Ioannina, Greece
Publication date: March 1, 2011