Tuning electrical heterogeneity in CaCu3Ti4O12-ZnO ceramics for high dielectric and nonlinear properties. (August 2023)

• Record Type: Journal Article
• Authors: Mao, Pu; Zeng, Congbin; Guo, Yongguang; Lu, Gang; Yan, Qingsong; Liu, Zhiyong; Xie, Bing; Zhao, Yingying; Guo, Kun; Zhang, Lixue
• Is Part Of: Materials research bulletin. Volume 164(2023)
• Publication Date: 2023-08
• Subjects: CCTO ceramics -- Dielectric properties -- Nonlinear characteristics -- Electrical heterogeneity -- Nano ZnO; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2023.112276
• Languages: English
• ISSNs: 0025-5408

Abstract

Highlights: The CCTO ceramics introduced by nano ZnO were successfully fabricated by a typical solid-state method. The electrical heterogeneity of CCTO-ZnO ceramics is effectively modulated. The CCTO-ZnO ceramics exhibits a lower dielectric loss of 0.07 at 1 kHz and maintains the colossal permittivity response. The nonlinear behaviors of CCTO-ZnO ceramics are also enhanced. Abstract: Tuning the electrical heterogeneity of CaCu3 Ti4 O12 (CCTO) ceramic is extremely important to improve its properties. In this work, the CCTO ceramics with enhanced dielectric and nonlinear properties were obtained by the introduction of nano ZnO based on the electrical heterogeneity modulation strategy. As a result, all the CCTO-ZnO samples show the colossal dielectric constant of 10 4 –10 5 at room temperature. Meanwhile, the dielectric constant of CCTO-ZnO samples exhibits better stability in a wide frequency range from 10 1 Hz to 10 5 Hz and over a temperature scope of 30–210 °C. Most importantly, the x = 0.04 sample presents a relatively lower room-temperature dielectric loss of about 0.07 at 10 3 Hz. Furthermore, the breakdown field strength accompanied by the nonlinear coefficient of CCTO-ZnO ceramics is also improved. The enhancement of dielectric and nonlinear behaviors in these ceramics is mainly ascribed to the tunable electrical heterogeneity as per the internal barrier layer capacitor (IBLC) model. Graphical abstract: Image, graphical abstract