A novel NTC ceramic based on La2Zr2O7 for high-temperature thermistor |
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| Affiliation: | 1. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;2. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China;3. National Laboratory of Solid State Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, School of Physics, Nanjing University, Nanjing 210093, China;4. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | A novel negative temperature coefficient material based on lanthanum zirconate ceramics was proposed for high-temperature applications. This material was synthesized through a solid-state reaction by sintering at 1923 K for 10 h in air. The X-ray diffraction and scanning electron microscopy results confirmed that La2Zr2O7 ceramics exhibited a pyrochlore phase with a relative density of 98.2 %. The resistance–temperature characteristics of the material revealed that La2Zr2O7 ceramics exhibited an NTC feature within the broad temperature range of 973–1773 K in addition to maintaining high thermal constant B, and resistivity to ensure good sensitivity at high temperatures. These properties, along with high ceiling temperature, unique oxygen insensitivity, and excellent ageing coefficient of <0.7 % at 1773 K, render La2Zr2O7 ceramics a promising candidate as thermistor materials with high-temperature NTC. |
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| Keywords: | Lanthanum zirconate Pyrochlore-type structure Negative temperature coefficient High temperature NTC thermistor Electrical properties |
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