Fe doped Ni-Mn-Co-O ceramics with varying Fe content as negative temperature coefficient sensors

被引:33
作者
Han, HyukSu [1 ]
Mhin, Sungwook [2 ]
Park, Kyoung Ryeol [2 ,3 ]
Kim, Kang Min [1 ]
Lee, Jung-Il [4 ]
Ryu, Jeong Ho [4 ]
机构
[1] Korea Inst Ind Technol, 137-41 Gwahakdanji Ro, Gangneung Si 25440, Gangwon Do, South Korea
[2] Korea Inst Ind Technol, Gaetbeol Ro 156, Incheon 21999, South Korea
[3] Hanyang Univ, Dept Mat Sci & Engn, Seoul 04763, South Korea
[4] Korea Natl Univ Transportat, Dept Mat Sci & Engn, Chungju 27469, Chungbuk, South Korea
基金
新加坡国家研究基金会;
关键词
Fe-Ni-Mn-Co-O; Single cubic spinel structure; Nanopowders; Thermistors; Sol-gel combustion; ELECTRICAL-PROPERTIES; THERMISTORS; SYSTEM; OXIDES; CU;
D O I
10.1016/j.ceramint.2017.05.108
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Fe-doped Ni-Mn-Co-O (FNMC) ceramics with the formula, (FexNi0.3Co0.9Mn1.8-x, x=0.1, 0.3, 0.5, and 0.7)O-4 were synthesized using a spray drying process. Effect of Fe content on the phase evolution of FNMC compound during heat treatment was studied using X-ray diffraction. A single phase cubic spinel structure with improved crystallinity was observed when the Fe content increased over 0.5. Fe, Ni, Mn and Co ions were homogeneously distributed in the sintered the FNMC ceramics, implying no phase separation occurred during sintering. The valence state of each element was analyzed using X-ray photoelectron spectroscopy, which revealed that Ni, Co, and Fe might have a single valence state while Mn had mixed valence states in the FNMC spinel compounds. The temperature-dependent electrical resistance for the FNMC ceramics was measured. Room temperature resistance and the B-value substantially increased for the FNMC samples with Fe content higher than 0.5. The electrical properties of FNMC compounds can be optimized by controlling the Fe content, which is directly indicative of their potential role as negative temperature coefficient sensors.
引用
收藏
页码:10528 / 10532
页数:5
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