期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 37, 期 15, 页码 4653-4659出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.06.046
关键词
CaCu3Ti4O12; Co-doping; Dielectric property; Colossal dielectric constant ceramic
资金
- National Natural Science Foundation of China [21571095, 51362020, 61366004]
- Jiangxi Provincial Department of Education [KJLD13008]
Different doping elements have been used to reduce the dielectric losses of CaCu3Ti4O12 ceramics, but their dielectric constants usually are undesirably decreased. This work intends to reduce their dielectric losses and simultaneously enhance their dielectric constants by co-doping Y3+ as a donor at A site and Al3+ as an acceptor at B site for substituting Ca2+ and Ti4+, respectively. Samples with different doping concentrations x = 0, 0.01, 0.02, 0.03, 0.05 and 0.07 have been prepared. It has been shown that their dielectric losses are generally reduced and their dielectric constants are simultaneously enhanced across the frequency range up to 1 MHz. The doped sample with x = 0.05 exhibits the highest dielectric constant, which is well over 10(4) for frequency up to 1 MHz and is about 20% higher than the undoped sample. Impedance spectra indicate that the doped samples have much higher grain boundary resistance than the undoped one. (C) 2017 Elsevier Ltd. All rights reserved.
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