Journal
PHYSICA B-CONDENSED MATTER
Volume 405, Issue 1, Pages 386-389Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2009.08.093
Keywords
Dielectrics; Grain boundaries; CCTO; Ceramics
Categories
Funding
- National Basic Research Program of China [2007CB310407]
- International S&T Cooperation Program of China [2006DFA53410, 2007DFR10250]
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CaCu3Ti4-xFexO12 (0 <= x <= 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 (epsilon') decreases from about 5 x 10(4) to 50 in the frequency range from 1 kHz to 1 MHz, while epsilon' of all Fe-doped samples at high temperature re-increased 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. (C) 2009 Elsevier B.V. All rights reserved.
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