Optimize the dielectric properties of CaCu3Ti4O12 ceramics by adjusting the conductivities of grains and grain boundaries. Issue 3 (March 2023)

• Record Type: Journal Article
• Authors: Hao, Wentao; Xu, Panpan; Han, Peide; Wang, Mingwen
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 3(2023)
• Page Start: 986
• Page End: 992
• Publication Date: 2023-03
• Subjects: CaCu3Ti4O12 -- Internal barrier layer capacitance effect -- Low-frequency dielectric loss -- Carbon -- Annealing; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.11.022
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Reduction of dielectric loss for CCTO ceramics is a prerequisite for their applications. Considering internal barrier layer capacitance effect, improving the capacitance and grain boundary resistance is an effective way to reduce dielectric loss. Therefore, more conductive Ti 3+ and Cu + ions were introduced to grains by adding carbon to ceramic bodies, improving the permittivity of CCTO ceramics. Annealing was performed to increase the grain boundary resistance. The dielectric loss of the CCTO ceramics thus prepared, which maintain a giant permittivity, is significantly reduced. Specifically, the CCTO ceramic with carbon addition, which was sintered at 1080 °C for 8 h and air annealed at 950 °C for 2 h, exhibits a giant permittivity of about 2.50(5)×10 4 and a low dielectric loss of less than 0.050(2) from below 20 Hz to 50 kHz at room temperature. Meanwhile, its dielectric loss at 1–10 kHz is less than 0.050(2) from below room temperature to about 100 °C.