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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