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Influences of Sintering Temperature on Piezoelectric, Dielectric and Ferroelectric Properties of Li/Ta-Codoped Lead-Free (Na,K)NbO3 Ceramics

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Li/Ta-codoped lead-free (Na,K)NbO3 ceramics with a nominal composition of [(Na0.535K0.480)0.942Li0.058](Nb0.90Ta0.10)O3 were synthesized normally at 1070°–1100°C. The XRD patterns of all samples show a single pervoskite structure with tetragonal symmetry. Although MPB separating the orthorhombic and tetragonal symmetries was absent, the maximum piezoelectric coefficient (d33), electromechanical coupling coefficient (kp), Curie temperature (Tc), and remanent polarization (Pr) were optimized as 216 pC/N, 38.1%, 445°C, and 8.73 C/cm2, respectively.
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Document Type: Research Article

Affiliations: 1: School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2: State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Publication date: May 1, 2008

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