Microstructure-dependent giant dielectric response in CaCu 3Ti 4O 12 ceramics

• Published in: Solid state communications Vol. 139; no. 2; pp. 45 - 50
• Main Authors: Ni, L., Chen, X.M., Liu, X.Q., Hou, R.Z.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2006
• Subjects: A. CaCu 3Ti 4O 12; B. Perovskite-related compound; C. Dielectric properties; D. Giant dielectric constant; E. Microstructures; B. Perovskite-related compound; D. Giant dielectric constant; A. CaCu 3Ti 4O 12; 77.22.Gm; 77.90.+k; 77.22.Ch; C. Dielectric properties; E. Microstructures
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/j.ssc.2006.05.015

CaCu 3Ti 4O 12 ceramics were prepared at the sintering temperatures ranged from 1025 to 1125 °C, and the dielectric characteristics were evaluated together with the microstructures. The giant dielectric constant with the maximum of 53,120 was obtained in CaCu 3Ti 4O 12 ceramics at room temperature and 10 kHz, and strong processing and microstructure dependence of dielectric characteristics of the present ceramics was determined. The precipitation of the dispersed Cu-rich secondary phases of CuO and/or Cu 2O and their network structure provided the extrinsic origins of the enhanced giant dielectric response, and the present findings would offer the greater potential for enhancing the giant dielectric constant and controlling the dielectric loss in CaCu 3Ti 4O 12 ceramics by optimizing the microstructures.