Title :
Piezoelectric Properties of NaNbO3-BaTiO3 Ceramics
Author :
Aoyagi, R. ; Matsuoka, T. ; Iwata, M. ; Maeda, M.
Author_Institution :
Nagoya Inst. of Technol., Nagoya
Abstract :
(1-x)NaNbO3-xBaTiO3, (NNBTx; x=0.0-0.21) solid-solution ceramics were synthesized and their crystal structure, dielectric properties and piezoelectric properties were investigated. The crystal structure of NNBTx was varied from orthorhombic to tetragonal with increasing BaTiO3 content x. The morphotropic phase boundary at room temperature was observed between x=0.08 and 0.09, and the lattice anisotropy and Curie temperature in the tetragonal phase decreased with increasing x. The highest electromechanical coupling factor, k p , of 0.318 and the largest piezoelectric constant, d 33, of 164 pC/N were obtained for NNBT0.09 with the tetragonal phase, and the highest mechanical quality factor of 890 was obtained for NNBT0.06 with the orthorhombic phase.
Keywords :
Curie temperature; barium compounds; crystal structure; magnetic materials; permittivity; piezoceramics; sodium compounds; solid solutions; solid-state phase transformations; Curie temperature; NaNbO3-BaTiO3; crystal structure; dielectric properties; electromechanical coupling factor; lattice anisotropy; mechanical quality factor; morphotropic phase boundary; orthorhombic phase; piezoelectric constant; solid-solution ceramics; temperature 293 K to 298 K; tetragonal phase; Ceramics; Dielectric measurements; Ferroelectric materials; Lattices; Mechanical factors; Neural networks; Piezoelectric materials; Q factor; Solids; Temperature dependence;
Conference_Titel :
Applications of Ferroelectrics, 2007. ISAF 2007. Sixteenth IEEE International Symposium on
Conference_Location :
Nara
Print_ISBN :
978-1-4244-1334-8
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2007.4393365
