High-energy storage performance in lead-free (0.8-x)SrTiO3-0.2Na0.5Bi0.5TiO3-xBaTiO3 relaxor ferroelectric ceramics

• Published in: Journal of alloys and compounds Vol. 740; pp. 1180 - 1187
• Main Authors: Cui, Chenwei, Pu, Yongping, Shi, Ruike
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.04.2018
• Subjects: Ceramics; Energy storage density; Lead-free; Relaxor behavior; Ceramics; Energy storage density; Lead-free; Relaxor behavior
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.01.106

lead-free (0.8-x)SrTiO3-0.2Na0.5Bi0.5TiO3-xBaTiO3 ceramics (abbreviated as (0.8-x)ST-0.2NBT-xBT) were prepared by the conventional solid-state sintering method, and their crystal structure, dielectric properties, relaxor behavior and energy-storage property were investigated as a function of BT concentration. X-ray diffraction results reveal a pure perovskite structure with a pseudo-cubic phase. The dielectric measurements exhibit a relaxor behavior for all samples and the Tm gradually increases (from −49.67 °C to 67.91 °C) with increasing x. The pinched polarization-electric field (P-E) loops were observed in the samples with x ≤ 0.40 and the maximum polarization (Pm) increased from 11.37 μC/cm2 to 20.79 μC/cm2 at 8 kV/mm while x = 0.20–0.55. The maximum discharge energy-storage density (Jd) (1.78 J/cm3) is obtained in x = 0.35 ceramic with a relatively high Pm (29.19 μC/cm2) under an electric field of 17 kV/mm, which makes (0.8-x)ST-0.2NBT-xBT ceramics may be promising lead-free materials in practical high energy storage application. •The system of (0.8-x)ST-0.2NBT-xBT is relatively new.•Energy storage properties under different electric fields were studied.•Integrated energy storage and relaxation properties were studied at the same time.•The maximum discharge energy density of x = 0.35 sample reaches up to 1.78 J/cm3.