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Huining Wang,Zixin Zhang,QuanSen Yang,Fangfang Wang,Kang Yan 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2
Ionic doping is an important approach to modification of crystal structure and physical properties of the piezoelectric ceramics. In this work, the lead-free piezoelectric ceramic (1- x )K 0.18 Na 0.74 Li 0.08 NbO 3 - x AgNbO 3 (abbreviated as KNLN- x AN, 0 ≤ x ≤ 0.8) was prepared by conventional solid-state reaction method. The effect of the Ag doping on the phase structure, dielectric and ferroelectric properties of the KNLN-based ceramics was investigated by the XRD, DSC, dielectric and ferroelectric characterizations. It is found that all KNLN- x AN ceramics show single phase in perovskite structure because the ionic radii of dopant Ag close to the average ionic size at the A-site in KNLN. The KNLN- x AN exhibits the rhombohedral to orthorhombic phase transition at room temperature and the Curie temperature ( T C ) decreases to low temperature with increasing x value. A narrow tetragonal phase region and a wide orthorhombic phase region form for the compositions with x ≥ 0.4, indicating that the Ag doping stabilizes orthorhombic phase in wide temperature for the KNLN. A ferroelectric anomalies due to high electrical field induced phase transition is found in the sample with x = 0.1. When x = 0.4, high Curie temperature ( T C = 380 °C), large remnant polarization ( P r = 24.4 μC/cm 2 ) and high dielectric constant ( ε r = 10,000 at 1 kHz) at T C are achieved.
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