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Enhanced Piezoelectric and Ferroelectric Properties of Nb 2 O 5 Modified Lead Zirconate Titanate‐Based Composites
Author(s) -
Wang DaWei,
Cao MaoSheng,
Yuan Jie,
Zhao QuanLiang,
Li HongBo,
Zhang DeQing,
Agathopoulos Simeon
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04309.x
Subject(s) - materials science , lead zirconate titanate , composite material , piezoelectricity , dielectric , sintering , ferroelectricity , ceramic , fracture toughness , zirconate , flexural strength , composite number , titanate , optoelectronics
The addition of ZnO nanowhiskers (ZnO w ) in lead zirconate titanate (PZT) matrices results in reinforced composite materials but deteriorates their electrical properties. In this study, novel piezoelectric PZT/ZnO w composites modified with Nb 2 O 5 were successfully fabricated using solid‐state sintering method. The experimental results showed that the addition of 0.5 wt% Nb 2 O 5 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 d 33 =665 pC/N, electromechanical coupling factor k p =0.7, relative dielectric constant ɛ=5048, and remnant polarization P r =30.2 μC/cm 2 . The “soft effect” of Nb 5+ ions, reflected in the improvement of the aforementioned properties, is attributed to the accommodation of Nb 5+ ions at the B sites of the lattice of PZT. Compared with the PZT/ZnO w reinforced composites, the mechanical properties were slightly improved by adding 0.5 wt% Nb 2 O 5 , where flexural strength σ f of 128 MPa and fracture toughness K I C of 1.46 MPa·m 1/2 were measured.