期刊
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
卷 28, 期 22, 页码 17378-17387出版社
SPRINGER
DOI: 10.1007/s10854-017-7671-2
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资金
- National Natural Science Foundation of China [11264010, 11564010, 51402196]
- Natural Science Foundation of Guangxi [GA139008, 2016GXNSFDA380027]
- China Postdoctoral Science Foundation [2014M552229, 2015T80915]
Ca1-3x/2Y (x) Cu3Ti4O12 (0 <= x <= 0.67) ceramics were fabricated by a conventional solid-state reaction method. Lattice parameter of the system increases linearly with increasing x. The high-frequency dielectric loss of Ca1-3x/2Y (x) Cu3Ti4O12 is suppressed significantly while the dielectric constant decreases slightly. The dielectric, impedance and modulus spectra reveals that the giant dielectric response associates with the Maxwell-Wagner effect. The decrease of dielectric constant is just related to the capacitance of grain boundaries. The dielectric relaxation behavior of the system is independent of Y substitution while the correlation between conductivity and frequency becomes stronger in Y substituted CaCu3Ti4O12. It suggests that space charge and long-range hopping of carriers play important roles on the low-frequency dielectric properties. The decrease of grain-boundary activation energy with Y substitution indicates that the concentration of oxygen vacancies increases in grain boundaries. The mechanisms of depressing low-frequency dielectric constant and high-frequency dielectric loss was discussed.
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