Improvement of dielectric breakdown strength and energy storage performance in Er2O3–modified 0.95Sr0.7Ba0.3Nb2O6-0.05CaTiO3 lead-free ceramics. Issue 5 (1st April 2019)

• Record Type: Journal Article
• Authors: Cao, Lei; Yuan, Ying; Li, Enzhu; Zhang, Shuren
• Is Part Of: Ceramics international. Volume 45:Issue 5(2019)
• Page Start: 5660
• Page End: 5667
• Publication Date: 2019-04-01
• Subjects: Er2O3 addition -- Dielectric breakdown strength -- Impedance -- Energy storage; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.12.031
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, 0.95 Sr0.7 Ba0.3 Nb2 O6 -0.05CaTiO3 - x wt% Er2 O3 ceramics (SBNCTE x ; x = 0–5) were synthesized using traditional solid-state method, and we investigated the microstructure, energy storage properties as well as the relationship between dielectric breakdown strength and interfacial polarization. As compared with pure 0.95 Sr0.7 Ba0.3 Nb2 O6 -0.05CaTiO3 ceramics, the Er2 O3 dopants suppressed the grain growth of SBNCTE x, and the doped ones showed the dense microstructure. The secondary phase was found for x ≥ 1 according to the EDS results, and the influence of the secondary phase on relative dielectric breakdown strength has also been studied. The dielectric breakdown strength increased from 18.1 kV/mm to 34.4 kV/mm, which is good for energy storage. The energy storage density of 0.28 J/cm 3 and the energy storage efficiency of 91.4% were obtained in the SBNCTE5 ceramics. The results indicate that SBNCTE ceramics can be used as energy storage capacitors.