|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Electrical and Microstructural Investigation of Ni0.5Co0.5Cu0.3Zn0.3Mn1.4O4 Temperature Sensors
||Gökhan Hardal, Berat Yüksel Price
|On-Site Speaker (Planned)
Nickel manganite based negative temperature coefficient (NTC) thermistors have good temperature sensor characteristics and electrical stability for temperature measurement applications. In this study, the electrical and microstructural properties of Ni<SUB>0.5</SUB>Co<SUB>0.5</SUB>Cu<SUB>0.3</SUB>Zn<SUB>0.3</SUB>Mn<SUB>1.4</SUB>O<SUB>4</SUB> NTC thermistors were investigated. The samples were fabricated by conventional solid-state reaction method. The powders were calcined at 900<SUP>o</SUP>C for 2 hours and the samples were sintered at 1200 and 1300<SUP>o</SUP>C for 5 hours in air. The bulk density of samples was 5.07 and 4.96 g/cm<SUP>3</SUP>, respectively. The microstructure of samples was observed using a scanning electron microscopy. The electrical resistance was measured in a temperature programmable furnace between 25<SUP>o</SUP>C and 85<SUP>o</SUP>C. The electrical resistivity of Ni<SUB>0.5</SUB>Co<SUB>0.5</SUB>Cu<SUB>0.3</SUB>Zn<SUB>0.3</SUB>Mn<SUB>1.4</SUB>O<SUB>4</SUB> sample increased from 52 Ω.cm to 94 Ω.cm when the sintering temperature increased from 1200 to 1300<SUP>o</SUP>C. The material constant “B”, sensitivity coefficient “α” and activation energy “E<SUB>a</SUB>” values were also calculated for the NTC thermistors.
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