| Home | Log-in | Admin | Sitemap |
Home | Program | Detailed Program
Detailed Program
Paper Number : PI-P07
Time Frame : 12:00~13:30
Presentation Date : Thursday, 27, November
Session Name : Piezoelectric Device & Application
Session Chair 1# :
Session Chair 2# :
Enhanced Field-induced Strain Response of Nb-doped (Bi0.5Na0.5)0.935Ba0.065TiO3–SrZrO3 Lead-free Piezoceramics
Adnan MAQBOOL
Changwon National University
Field-induced strain of piezoelectric materials is widely utilized in numerous electromechanical devices. The crystal structure, dielectric properties, electric field-induced strain (EFIS), and polarization response of lead-free (Bi0.5Na0.5)0.935Ba0.065Ti(1–x)NbxO3–0.01SrZO3 (BNBTNb100x–SZ, with x = 0–1) ceramics were investigated. X-ray diffraction analysis revealed that all compositions had a pure perovskite structure with tetragonal symmetry.
The depolarization temperature (Td) shifted toward lower temperatures and the dielectric curves became more diffuse with increased Nb doping, producing a significant disruption of the long-range ferroelectric order. A giant EFIS of 0.33% was achieved at an optimized composition of Nb1.0 (BNBTNb1.0–SZ), corresponding to a normalized strain (Smax/Emax) of 825 pm/V at a low applied field of 4 kV/mm. Moreover, at a low applied field of 3 kV/mm, the Nb0.75 and Nb1.0 samples displayed a high EFIS response of 0.25%, corresponding to a Smax/Emax of 833 pm/V. These results suggest that BNBTNb–SZ ceramics are promising candidate materials for lead-free actuator applications.
Acknowledgements : This work is supported by the Basic Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry, Science and Technology (MEST) (2011-0030058).