| Home | Log-in | Admin | Sitemap |
Home | Program | Detailed Program
Detailed Program
Paper Number : PI-P06
Time Frame : 12:00~13:30
Presentation Date : Thursday, 27, November
Session Name : Piezoelectric Device & Application
Session Chair 1# : -
Session Chair 2# : -
Piezoelectric and Dielectric Properties of Non-stoichiometry (Na0.53+xK0.47+x)(Nb0.55Ta0.45)O3 ceramics
Mr. Sangyun Lim
Changwon National University
In the past two decades, to replace lead-based piezoelectric materials, many lead-free candidate materials were studied. Among these alternatives, (Na,K)NbO3(NKN)–based ceramics have been proposed as possible lead-free candidate materials because of their good piezoelectric constant (about 100 pC/N) and high Curie temperature (above 400 ¢®¨¡C). High piezoelectric properties can be obtained by controlling the phase coexistence region formed at the transition temperature between the orthorhombic and the tetragonal phase [1-3]. Numerous studies investigated the effects of the substitution of Li, Sb, Ta, Ag on the piezoelectric properties of the NKN ceramic [4, 5]. Ta substitution in (Na,K)(Nb,Ta)O3 affects the dielectric behavior and the piezoelectric properties, making this ceramic a possible candidate for practical applications [6, 7]. In this study, we investigated the effect of Na/K excess on the structural and electrical properties of Ta-modified (Na0.53+xK0.47+x)(Nb0.55Ta0.45)O3 ceramics (NKNT, x = - 0.01, - 0.005, 0, 0.005 and 0.01).
Acknowledgements : This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by Ministry of Education, Science and Technology (MEST) (2011-0030058).