Abstract
The new negative temperature coefficient (NTC) ceramics based on Ca1−xYxCu3Ti3.9Zr0.1O12 (x = 0, 0.01, 0.03, 0.05) compositions have been successfully synthesized by traditional solid-state method. The results of X-ray diffraction show that the major phase of all samples is CaCu3Ti4O12 (CCTO) with body-centered cubic structure. Scanning electron microscope images confirm that Y3+ doping can inhibit the growth of grains. X-ray photoelectron spectroscopy analysis fully demonstrates the coexistence of Cu+/Cu2+ and Ti3+/Ti4+ ions in ceramic samples, and also proves that with the increase of Y3+ content, the concentration of Cu+ and Ti3+ ions increases, which is the main reason for the decrease of resistivity. The resistivity of all ceramic specimens decreases with the increase of temperature, which is consistent with NTC behavior. The obtained values of ρ25, B200/500, and Ea of the sintered samples are in the range of 2.76 × 107–1.10 × 108 Ω cm, 6633–6755 K, and 0.572–0.582 eV, respectively.
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