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Ferroelectric and Piezoelectric Properties of Na1−xBaxNb1−xTixO3 Ceramics

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Piezoelectric ceramics Na1−xBaxNb1−xTixO3 with low BaTiO3 concentrations x have been prepared by the solid-state reaction method, and their ferroelectric and piezoelectric properties have been studied. The ceramics are classic ferroelectrics when x≤0.10, and the ferroelectric–paraelectric phase transition becomes diffusive when x≥0.15. A low doping level of BaTiO3 changes the NaNbO3 ceramics from antiferroelectric to ferroelectric. With the increase in BaTiO3 doping level, the Curie temperature of ceramics decreases linearly and the remnant polarization and coercive field also decrease, while their dielectric constant increases. Na0.9Ba0.1Nb0.9Ti0.1O3 ceramics show the largest piezoelectric constant d33 (147 pC/N) and good sinterability, suggesting that it is a good candidate for lead-free piezoelectric ceramics.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2006.01172.x

Affiliations: Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University Kowloon, Hong Kong, China

Publication date: September 1, 2006

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