Piezoelectric Properties and Depolarization Temperature of NaNbO3-LiNbO3 Lead-Free Piezoelectric Ceramics

Rintaro Aoyagi; Makoto Iwata; Masaki Maeda

doi:10.4028/www.scientific.net/KEM.388.233

Paper Titles

Dielectric Property of Poly- and Single-Crystalline BaTi₂O₅ Co-Substituted with SrO and ZrO₂
p.217

Preparation of Transparent SBN Ceramics and their Opto-Electrical Properties
p.221

Dielectric Properties in the Insoluble Compositions of BaTiO₃-CaTiO₃ Ceramics
p.225

Fabrication and Electrical Properties of (Bi_1/2Na_1/2)TiO₃-BiAlO₃ Ferroelectric Ceramics
p.229

Piezoelectric Properties and Depolarization Temperature of NaNbO₃-LiNbO₃ Lead-Free Piezoelectric Ceramics
p.233

Crystal Growth and Ferroelectric Properties of Superlattice-Structured Bi₄Ti₃O₁₂-PbBi₄Ti₄O₁₅ Single Crystals
p.237

Crystal Growth and Ferroelectric Properties in Bi_0.5Na_0.5TiO₃–BaTiO₃ Crystals
p.241

Sintering and Dielectric Properties of Ba(Mg_1/3Ta_2/3)O₃ Particle Prepared by Spray Pyrolysis
p.245

Microstructures and Microwave Dielectric Properties on Annealed Al₂O₃-TiO₂ Composite Ceramics
p.251

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Piezoelectric Properties and Depolarization Temperature of NaNbO₃-LiNbO₃ Lead-Free Piezoelectric Ceramics

Abstract:

Piezoelectric and dielectric properties of (LixNa1-x)NbO3 (LNN100x; x≤0.14) ceramics were investigated according to phase transition The highest electromechanical coupling factor, kp, of 0.247 was obtained for LNN12 which has a composition with a morphotropic phase boundary at room temperature. On the other hand, the coupling factor of k33 with longitudinal mode was almost constant for all compositions of x. The dielectric constant, ε r, before poling treatment exhibited a thermal hysteresis near the Curie temperature, TC, for all compositions. The depolarization temperature of LNN6 was higher than the TC before poling treatment. In addition, the peak of free permittivity, ε33 T, was shifted to higher temperature. It was considered that the phase transition was induced by the electric field during poling treatment.