Abstract
Lead-free piezoelectric ceramics with compositions of (1 − x)Bi1/2(Na0.82 K0.18)1/2TiO3 + xSr(K0.25Nb0.75)O3, which are abbreviated as (1 − x)BNKT-xSKN with x = 0, 0.01, 0.02, 0.03, 0.04, and 0.05, were synthesized using a conventional solid-state reaction method. The effects of SKN addition on the BNKT system were examined in terms of the phase transition, strain behavior, and ferroelectric and dielectric properties. X-ray diffraction revealed a single perovskite phase for all compositions. The results showed that with increasing SKN content, BNKT-SKN underwent a phase transition from the coexistence of rhombohedral and tetragonal phases to a tetragonal phase. The addition of SKN shifted the depolarization temperature, T d, to a lower temperature and enhanced the diffuseness of the dielectric peaks. The polarization and bipolar strain hysteresis loops of BNKT-SKN showed that the addition of SKN induced a ferroelectric to ergodic relaxor phase transition with a disruption of the ferroelectric order of pure BNKT. As a result, the strain of BNKT-SKN improved significantly with increasing SKN content and reached the highest value of a normalized strain, S max/E max, of 557 pm/V, when modified with 3 mol.% SKN.
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Acknowledgements
This study was funded by Vietnam National Foundation for Science and Technology Department (NAFOSTED), under Grant Number 103.02-2012.55. J. S. Lee thanks financial support by the National Research Foundation of Korea (NRF) Grant (2013R1A1A2058917).
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Tran, V.D.N., Ullah, A., Dinh, T.H. et al. Large Field-Induced Strain Properties of Sr(K0.25Nb0.75) O3-Modified Bi1/2(Na0.82K0.18)1/2TiO3 Lead-Free Piezoelectric Ceramics. J. Electron. Mater. 45, 2627–2631 (2016). https://doi.org/10.1007/s11664-016-4445-1
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DOI: https://doi.org/10.1007/s11664-016-4445-1