| Structure and electrical properties of Pr6O11-doped CaCu3Ti4O12 NTC ceramics |
| Yang Zuo1,2, Jian Tian1, Yuxin Tian2, Guangtan Miao3, Peng Fu3 |
1School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
2School of Information and Electronics; Shandong University Key Laboratory of Perception Technology and Control, Shandong Technology and Business University, Yantai 264005, People’s Republic of China
3School of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, People’s Republic of China |
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Received: June 9, 2022; Revised: November 23, 2022 Accepted: December 8, 2022. Published online: January 4, 2023. |
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| ABSTRACT |
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The xPr6O11–(1 − x )CaCu3Ti4O12 (CCTO) ceramics with perovskite structure were prepared by the solid-state reaction method. The effects of Pr6O11 addition on the microstructure and electrical properties of the CCTO ceramics were studied. The addition of Pr6O11 promoted the sintering of CCTO ceramics, and the mean grain sizes increased gradually from 2.13 to 5.08 μm with increasing Pr6O11 content. All the samples had noticeable negative temperature coeffi cient (NTC) effect, and both the grain and grain boundary effects contributed to their NTC characteristics. The thermistor characteristic parameter B25/75 decreased from 6883 to 5291 K as Pr6O11 contents increased from 0.00 to 0.08. The analysis shows that the conductivity of Pr 6 O 11 –CCTO ceramics arises mainly from the electron hopping transport mechanism. The GB resistances are noticeably higher than grain resistances at the same Pr6O11 content. All the samples showed electrical relaxation behavior. The above observations indicate that the structures and electrical properties of CCTO ceramics can be attuned precisely by adjusting the Pr6O11 concentration. |
| Key words:
CaCu3Ti4O12 ceramics · Microstructure · NTC eff ect · Electrical properties |
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