Preparation and characterization of BaCo0.5Nb0.5O3-based new high temperature NTC sensitive ceramics
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A new type of high temperature NTC thermal sensitive ceramics BaCoxNbxTi(1−2x)O3 (BCNT) was synthesized via a solid-state reaction process. The as-prepared ceramics were obtained by sintering at 1300 °C for 1 h in air. According to the XRD and SEM analysis, BCNT form a solid solution with cubic phase, and the content of BaTiO3 (BT) has insignificant influence on the mean grain size of the ceramics. The BaCo0.5Nb0.5O3 (BCN) based materials show typical NTC effect in the whole temperature measuring range (25–500 °C). The room temperature resistivity (ρ25), thermal constant (B25/85) and activation energy (Ea) increase monotonously with the increase of BT content. The TG-DSC results show that there is no phase transition in the temperature range from 25 to 1000 °C, which indicate that the structure of the BCN-based ceramics is stable at high temperature.
The authors gratefully acknowledge the National Science Foundation of China (Grant No. 51462005) for providing the financial support.
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