Abstract
In this paper, Sm-doped 0.96(K0.48Na0.52)(Nb0.95Sb0.05)–0.04Bi0.5(Na0.82K0.18)0.5ZrO3 (abbreviated as KNSN–0.04BNKZ) lead-free piezoelectric ceramics were prepared by conventional solid-state sintering method and the effects of Sm2O3 on the phase structure, microstructure, electrical and luminescent properties of KNSN–0.04BNKZ potteries were studied. Results revealed that a single solid solution phase with pseudo-cubic perovskite structure was formed between KNSN–0.04BNKZ and Sm2O3. Existence of weak dielectric/ferroelectric properties with a diffuse dielectric anomaly and slim P–E hysteresis loops of the Sm-doped KNSN–0.04BNKZ demonstrated the ferroelectric relaxor behavior of the KNNS–0.04BNKZ–xSm ceramics. Accordingly, the temperature stability and fatigue behavior of the modified ceramics were significantly improved. It was found that the KNSN–0.04BNKZ ceramics with 0.002 mol Sm addition exhibited nearly temperature independent properties and fatigue-free behavior. Moreover, Sm-modified KNSN–0.04BNKZ exhibits a bright photoluminescence with a strong orange emission under visible light irradiation. As a material with both electrical and luminescent properties, it has good application prospect in future optoelectronic components by integrating its luminescent and electrical properties.
Highlights
Piezoelectric ceramics have the ability to perform direct conversion between mechanical energy and electrical energy, and these materials are of great value to theJ Adv Ceram 2020, 9(1): 72–82 materials [10,14]
The remnant polarization Pr and unipolar strain Suni show very slight changes with temperature. These results indicate that the Sm-doped KNSN–0.04BNKZ ceramics exhibit relatively good temperature stability in the measured temperature range
Results revealed that Sm3+ diffuses into KNSN–0.04BNKZ to form a new solid solution, and all samples exhibit a single perovskite structure with pseudo-cubic phase at room temperature
Summary
Piezoelectric ceramics have the ability to perform direct conversion between mechanical energy and electrical energy, and these materials are of great value to the. Other methods that can further optimize the performance of KNN-based materials are under continuous research [25,26,27]. Researchers found that, ion doping as a more prominent one in these methods can optimize the performance of KNNbased piezoelectric materials. Rare-earth ions doping can endow KNN-based ceramics with the attractive optical properties besides the enhanced piezoelectric properties [13,16, 17,28,29,30,31,32,33,34]. Wu’s group reported Er-doped KNN-based lead-free ferroelectric transparent ceramics with excellent piezoelectric and optical multifunctional performances. Wei et al [32] proposed rare earth Pr3+ doped KNN lead-free material which exhibited excellent piezoelectric and photoluminescence properties. A novel environmentally friendly luminescent ferroelectric material was fabricated by introducing trivalent Sm3+ as the activator into KNSN– 0.04BNKZ ceramics
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