Enhanced energy-storage performance and thermally stable permittivity for K0.5Na0.5NbO3 modified [(Na0.5Bi0.5)0.84Sr0.16]0.98La0.01TiO3 lead-free perovskite ceramics. Issue 7 (May 2020)

• Record Type: Journal Article
• Authors: Yan, Benben; Fan, Huiqing; Yadav, Arun Kumar; Wang, Chao; Zheng, Xiaokun; Wang, Hao; Wang, Weijia; Dong, Wenqiang; Wang, Shuren
• Is Part Of: Ceramics international. Volume 46:Issue 7(2020)
• Page Start: 9637
• Page End: 9645
• Publication Date: 2020-05
• Subjects: Perovskite -- Temperature-stable permittivity -- Relaxor ferroelectric -- Energy-storage properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.12.230
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: (1- x )[(Na0.5 Bi0.5 )0.84 Sr0.16 ]0.98 La0.01 TiO3 - x K0.5 Na0.5 NbO3 (abbreviated as NBSLT-100 x KNN) lead-free perovskite relaxor ferroelectric ceramics are synthesized through the conventional solid-state reaction. The effects of KNN on the ceramic polycrystalline structure, dielectric temperature stability, and energy-storage characteristics are studied systematically. All samples exhibit a single perovskite structure and compact surface morphology. Thermally stable dielectric permittivity ( ε ′) is obtained from 62 to 331 °C range for NBSLT-5KNN ceramic with ε ′ ~ 2286 at 150 °C less than ± 10% fluctuation rate. The addition of KNN refines the hysteresis loops and gradually increases the dielectric breakdown strength, which endows NBSLT-5KNN ceramic with the best energy-storage performance compared to other compositions. A high effective energy-storage density ( W rec ) ~ 1.234 J/cm 3 with efficiency ( η ) ~ 74.7% are acquired at 90 kV/cm. The energy-storage performance is revealed an excellent fatigue resistant stability. Hence, the introduction of KNN makes NBSLT-5KNN ceramic an outstanding competitor for energy-storage equipment applications.