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- Title
Enhancement of energy-storage properties of KNaNbO modified NaBiTiO-KBiTiO lead-free ceramics.
- Authors
Zhao, Jiefeng; Cao, Minghe; Wang, Zhijian; Xu, Qi; Zhang, Lin; Yao, Zhonghua; Hao, Hua; Liu, Hanxing
- Abstract
A lead-free ceramics (1 − x)(0.84NaBiTiO-0.16KBiTiO)-xKNaNbO (x = 0, 0.03, 0.06, 0.09, 0.12, 0.15) for energy-storage application have been fabricated by conventional solid state method. All compositions were crystallized into perovskite solid solution structure ascertained by XRD. SEM micrograph revealed that homogeneous grain could be obtained by addition of appropriate KNaNbO(KNN). The depolarization temperature (T) decreased significantly from 140 to 70 °C, while the maximum dielectric constant temperature (T) reduced slightly with increasing KNN. And the addition of KNN improved the energy-storage properties significantly by weakening the ferroelectricity of NaBiTiO-KBiTiO(NBT-KBT) ceramics. When x = 0.09, the highest energy-storage density (W = 1.51 J/cm) and energy efficiency (η = 65.0 %) were obtained at room temperature. Besides, the temperature stability of energy-storage density could satisfy ΔW/W ≤ ±20 % when the addition of KNN was over 0.09 from 20 to 150 °C.
- Subjects
ENERGY storage; LEAD-free ceramics; SOLID state electronics; PEROVSKITE; X-ray diffraction; SCANNING electron microscopy
- Publication
Journal of Materials Science: Materials in Electronics, 2016, Vol 27, Issue 1, p466
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-015-3775-8