Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 522, Issue -, Pages 157-161Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.01.128
Keywords
CaCu3Ti4O12; Sol-gel; Dielectric properties; Varistor
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Funding
- Natural Science Foundation of Jiangsu Province [BK2011243]
- Research Foundation of Jiangsu University [11JDG084]
- State key Laboratory of Electronic Thin Films and Integrated Devices [KFJJ201105]
- Shanghai Municipal Education Commission [J50102]
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry of Jilin University
- State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KF201104]
- State Key Laboratory of Electrical Insulation and Power Equipment [EIPE11204]
- Universities Natural Science Research Project of Jiangsu Province [10KJD430002]
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Zn-substituted CaCu3Ti4O12 ceramics were prepared by the sol-gel method. Their microstructures and electrical properties were investigated. XRD patterns showed that the CaCu3-xZnxTi4O12 (CCZTO) (x = 0.00, 0.06, 0.10, 0.20) ceramics, after sintering at 1050 degrees C for 20 h, were single phase with no Cu-rich phase. SEM results indicated that the samples had smaller grain sizes than those synthesized by traditional solid-state reaction methods. The dielectric and varistor properties of CCZTO were analyzed by a precision impedance analyzer and a varistor tester, respectively. According to Debye's equation, which states that the smaller the leakage current, the smaller the dielectric loss will be in the low-frequency region, we were able to roughly predict the relative value of the dielectric loss at low frequency by the leakage current. The best overall properties were obtained for x = 0.06 (CaCu2.94Zn0.06Ti4O12), which has several prospective applications, such as low voltage varistor switchings, gas-sensing devices, and varistor-capacitor double property devices. (C) 2012 Elsevier B.V. All rights reserved.
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