High-temperature dielectric properties of Bi0.5Na0.5TiO3–NaNbO3–Sr0.8Na0.4Nb2O6 ceramics. Issue 9 (1st May 2022)

• Record Type: Journal Article
• Authors: Wan, Yuhui; Cao, Fulin; Song, Jiachen; Hou, Ningjing; Ren, Pengrong; Yan, Fuxue; Lu, Xu; Ma, Ming; Song, Kexin; Zhao, Gaoyang
• Is Part Of: Ceramics international. Volume 48:Issue 9(2022)
• Page Start: 13041
• Page End: 13046
• Publication Date: 2022-05-01
• Subjects: High-temperature capacitor -- Dielectric stability -- BNT-based materials; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.01.178
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Dielectric materials 0.99((1-x)Bi0.5 Na0.5 TiO3 -xNaNbO3 )-0.01Sr0.8 Na0.4 Nb2 O6 (BNT-xNN-SNN) with x = 0.15, 0.20, 0.25 and 0.30 have been developed for high-temperature capacitors. Temperature-dependent dielectric permittivity ε′ and loss tan δ, DC resistivity and ferroelectric properties are reported. The ε′ and tan δ of the BNT-0.25NN-SNN ceramic are very stable over a wide temperature range (<-55 °C ∼ >350 °C), in which the variable rates of ε ′ (∣ ε′ - ε′ 25 °C ∣/ ε′ 25 °C ), and tan δ are no more than 15% and 0.02, respectively. In addition, ε′ at a reference temperature 25 °C is 1250. The resistivity is also high on the order of magnitude of 10 11 Ω m at 100 °C and 10 8 Ω m at 300 °C. The RC constant is approximately 2.8 s at 300 °C. The results show that the BNT-0.25NN-SNN ceramic is a good candidate material for high-temperature capacitors.