Abstract
The Ca1−xLaxCu3Ti4O12 (0 ≤ x ≤ 0.3) ceramics have been successfully prepared by the traditional solid-state reaction method at 1090 °C for 10 h. Effects of La3+ doping on the structure and negative temperature coefficient electrical properties of Ca1−xLaxCu3Ti4O12 ceramics are investigated in detail. Scanning electron microscope images demonstrate that the grain size of ceramic samples decreases with the increasing La3+ content. X-ray photoelectron spectroscopy analysis further confirms the coexistence of Cu+/Cu2+ and Ti3+/Ti4+ ions, which is one of the considerable contributors to the electrical conductivity of Ca1−xLaxCu3Ti4O12 ceramics. All the prepared ceramics show a linear relationship between the natural logarithm of the resistivity and the reciprocal of absolute temperature, indicating NTC characteristics. The obtained values of ρ25, B200/400 and Ea for the thermistors are in the range of 2.00 × 105–5.22 × 107 Ω cm−1, 2644–4205 K, 0.228–0.363 eV, respectively.
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Acknowledgments
We would like to acknowledge financial support from the National Natural Science Foundation of China (Grant No. 61871377) and the West Light Foundation of the Chinese Academy of Sciences (Grant No. 2015-XBQN-B-13).
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Jia, X., Zhang, B. & Chang, A. New negative temperature coefficient ceramics in La-doped CaCu3Ti4O12 system. J Mater Sci: Mater Electron 30, 10217–10223 (2019). https://doi.org/10.1007/s10854-019-01358-1
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DOI: https://doi.org/10.1007/s10854-019-01358-1