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Enhanced Energy‐Storage Properties of Lanthanum‐Doped Bi 0.5 Na 0.5 TiO 3 ‐Based Lead‐Free Ceramics
Author(s) -
Yang Haibo,
Yan Fei,
Lin Ying,
Wang Tong
Publication year - 2018
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700504
Subject(s) - materials science , energy storage , dielectric , ceramic , sintering , lanthanum , analytical chemistry (journal) , doping , capacitor , mineralogy , metallurgy , voltage , inorganic chemistry , thermodynamics , optoelectronics , electrical engineering , chemistry , engineering , power (physics) , physics , chromatography
A series of Bi (0.5− x ) La x (Na 0.82 K 0.18 ) 0.5 Ti 0.96 Zr 0.02 Sn 0.02 O 3 (BNKTZS‐ x L) ( x= 0–0.18) lead‐free ceramics were designed and fabricated by using a conventional solid‐state sintering method. The effects of the La 3+ content on the properties of the BNKTZS‐ x L ceramics were systematically investigated. Temperature‐dependent dielectric constant curves displayed two depressed anomalies, which resulted in significantly improved dielectric temperature stability. The polarization–electric field hysteresis loops illustrated that the addition of La 3+ markedly enhanced the breakdown strength, energy‐storage density, and energy‐storage efficiency. A maximum energy‐storage density of 1.95 J cm −3 was obtained for the material with x= 0.10, and the energy‐storage efficiency significantly improved from 28 to 85 % upon increasing the value of x from 0 to 0.18. These properties indicate that the BNKTZS‐ x L ceramics may be promising lead‐free materials for high energy‐storage capacitor applications.