Influence of temperature on dielectric properties of Fe-doped CaCu3Ti4O12 ceramics

✍ Scribed by Chunhong Mu; Huaiwu Zhang; Ying He; Peng Liu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 518 KB
• Volume: 405
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2009.08.093

✦ Synopsis

CaCu 3 Ti 4 À x Fe x O 12 (0 rx r 0.2) ceramics were fabricated by a solid-state reaction method, and the dielectric properties were studied. Dielectric measurement performed at room temperature shows that with Fe content increasing from 0 to 0.2, the dielectric constant (e 0 ) decreases from about 5 Â 10 4 to 50 in the frequency range from 1 kHz to 1 MHz, while e 0 of all Fe-doped samples at high temperature reincreased to a high level of 10 5 below 10 kHz, characterized by dielectric temperature spectrum. Interestingly, two dielectric relaxations named as I and II are observed with the increasing of temperature. In order to catch the intrinsic relaxation mechanism, the IBLC model and modulus approach are adopted to clarify these fantastic dielectric properties.