Sol–gel synthesized pure CaCu3Ti4O12 with very low dielectric loss and high dielectric constant. Issue 10 (December 2015)

• Record Type: Journal Article
• Authors: Sun, Li; Wang, Zhenduo; Shi, Yongjie; Cao, Ensi; Zhang, Yongjia; Peng, Hua; Ju, Lin
• Is Part Of: Ceramics international. Volume 41:Issue 10(2015)Part A
• Page Start: 13486
• Page End: 13492
• Publication Date: 2015-12
• Subjects: C. Dielectric properties -- CaCu3Ti4O12 -- Sol–gel method -- IBLC; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.07.140
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: CaCu3 Ti4 O12 ceramics were synthesized by the sol–gel method. The microstructural and dielectric properties were investigated. X-ray powder diffraction analysis indicated that no second phase occurred. The dielectric properties were investigated in the frequency range between 20 Hz and 2 MHz, and the dielectric constants ( ε ′) of CaCu3 Ti4 O12 ceramic samples sintered above 1040 °C only changed slightly while f ≤400 kHz. Meanwhile, the loss tangent (tan δ ) was below 0.05 in a relatively wide frequency range in some samples, and a very low tan δ 0.028 was observed in the sample sintered at 1100 °C for 16 h with ε ′=18, 225 at 1 kHz. These results indicate that the CaCu3 Ti4 O12 ceramics have a promising prospect in future applications with sufficiently low tan δ and high ε ′.