Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 28, Issue 12, Pages 1145-1150Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/S1005-0302(12)60184-4
Keywords
Ceramics; dc electric current; Dielectric properties; Doping
Funding
- National Natural Science Foundation of China [51172166, 51202078]
- Huazhong University of Science and Technology, China [01-18-185011]
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CaCu3-xFexTi4O12 (x=0, 0.015, 0.03, 0.045, 0.06) ceramics were synthesized by sol-gel method. The electrical conduction and dielectric measurements show that the doping of a very small amount of Fe3+ ions greatly reduces the low-frequency dielectric constants and leakage, and enhances grain resistivity. For the doped samples, the appearance of the strong low-frequency peaks in the spectra of dielectric loss confirms that the doping of Fe3+ ions induces the contact-electrode effect on ceramic surface. These great changes of electrical properties may originate from the reduced amount of oxygen vacancies by doping Fe3+.
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