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Published in:
01-07-2015
Investigation of structural and electrical properties of B-site complex ion (Nd1/2Ta1/2)4+-doped Bi1/2Na1/2TiO3 lead-free piezoelectric ceramic
Published in: Journal of Materials Science: Materials in Electronics | Issue 7/2015
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Abstract
The Bi1/2Na1/2Ti1−x
(Nd1/2Ta1/2)
x
O3 lead-free piezoelectric ceramics were fabricated by a conventional solid-state reaction method. The phase structure, microstructure, and dielectric, ferroelectric and piezoelectric properties of the ceramics were investigated. A reduction of small amount of oxygen vacancies, a significant effect in grain size due to the (Nd1/2Ta1/2)4+ doping, led to the enhancements of the dielectric, ferroelectric and piezoelectric properties of Bi1/2Na1/2Ti1−x
(Nd1/2Ta1/2)
x
O3 ceramics, and the optimized modification was x = 0.006. The electrical properties of modified samples were deteriorated with further doping (x >0.006), owing to an increase in the concentration of oxygen vacancies. The BNT-NT ceramics with x = 0.006 was found to have a high remnant polarization (P
r
) of 34.7 μC/cm2 and a piezoelectric constant (d
33
) of 110 pC/N.