Energy storage properties and electrical behavior of lead-free (1 − x) Ba0.04Bi0.48Na0.48TiO3–xSrZrO3 ceramics
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(1 − x) Ba0.04Bi0.48Na0.48TiO3–xSrZrO3 (x = 0.08, 0.12, 0.15, 0.18 and 0.2, abbreviation as ‘BBNT-xSZ’) lead-free ceramics were synthesized by conventional solid-state reaction processes. Microstructures and electrical properties of BBNT-xSZ ceramics were investigated. XRD analysis reveals a pure perovskite phase without obvious phase transition with the addition of SZ. All BBNT-xSZ ceramics show high density and the grain sizes increase slightly with an increase of SZ concentration. Meanwhile, the energy storage density increases drastically, and a maximum value of 1.32 J/cm3 at E = 155 kV/cm is achieved in BBNT-0.15SZ through increasing greatly its breakdown strength with more SZ content. The temperature dependence of dielectric constant and dielectric loss of BBNT-xSZ ceramics illustrated the obvious relaxor phase transition characteristics. The BBNT-0.15SZ ceramic exhibits a high ionic conductivity accompanied by a low electronic conductivity. These properties support that (1 − x)Ba0.04Bi0.48Na0.48TiO3–xSrZrO3 ceramics might be a promising lead-free material for high energy-storage capacitor application.
KeywordsBaTiO3 Breakdown Strength Dielectric Anomaly Energy Storage Density Energy Storage Property
Financial supports of the National Natural Science Foundation of China (Grants No. 11464006) and the Natural Science Foundation of Guangxi (Grants No. 2014GXNSFBA118254) are gratefully acknowledged by the authors.
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