期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 582, 期 -, 页码 283-288出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.08.014
关键词
NTC ceramics; Mn-Ni-Cu-O system; Aging; Co-precipitation
资金
- Shenzhen Baoan District Industry-University cooperation projects in science and technology
Mn2.15Cu0.4Ni0.45O4 NTC ceramics were prepared by using co-precipitation and solid-state methods, their structure and properties were characterized by using scanning electron microscopy analysis, powder Xray diffraction, temperature dependent resistivity, and accelerated aging tests at 125 degrees C (aging temperature). Having similar resistivities before aging, the co-precipitation samples had lower relative resistance drifts (22.5%) as compared with the solid-state samples (39.5%) after aging for 800 h. Thus, co-precipitation could be an effective method to improve electrical stability of Mn-Ni-Cu oxide negative temperature coefficient ceramics. (C) 2013 Elsevier B.V. All rights reserved.
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