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《Journal of Inorganic Materials》 2011-10
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Microstructure and Electrical Properties of Mn_(2.25-x)Ni_(0.75)Co_xO_4 Thermistor Ceramics

PENG Chang-Wen1,2,3,ZHANG Hui-Min1,2,CHANG Ai-Min1,2,HUANG Xia1,2,3,YAO Jin-Cheng1,2,3(1.Xinjiang Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Urumqi 830011,China;2.Xinjiang Key Laboratory of Electronic Information Materials and Devices,Urumqi 830011,China;3.Graduate University of the Chi-nese Academy of Sciences,Beijing 100049,China)  
A series of composite of the negative temperature coefficient(NTC) powders of Mn2.25-xNi0.75CoxO4(0.8≤x≤1.2) materials were prepared via solid-state method.The particle size of calcined powders,ceramics phase structure,morphology and electrical properties were characterized by laser particle size analyzer,XRD,SEM and electrical measurements,respectively.The results show that when the Mn2.25-xNi0.75CoxO4 ceramics sintered at 1130?1230℃,their characteristic parameters B25/50 value are found to be in the range of 3487K to 4455K and their electrical resistivi-ties ρ25℃ are 1998 Ω?cm to 203617 Ω?cm.The B25/50 value and ρ25℃ first increases and then decreases as the Co content increases.This means that electrical resistivity and B value of Mn2.25-xNi0.75CoxO4 ceramics could be adjusted to the de-sired values and this ternary system can be considered as the advanced semi-conducting materials for NTC thermistor applications.
【Fund】: 国家自然科学基金(50902148);; 中科院“西部之光”(RCPY200901)~~
【CateGory Index】: TQ174.1
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