Electrical and Microstructural Investigation of Ni0.5Co0.5Cu0.3Zn0.3 Mn1.4O4 Temperature Sensors

Hardal G. , Price B. Y.

TMS Annual Meeting and Exhibition / Symposium on Characterization of Minerals, Metals, and Materials, California, United States Of America, 01 January 2017, pp.139-144 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1007/978-3-319-51382-9_16
  • City: California
  • Country: United States Of America
  • Page Numbers: pp.139-144


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 Ni0.5Co0.5Cu0.3Zn0.3Mn1.4O4 NTC thermistor were investigated. The samples were fabricated by the conventional solid-state reaction method. The powders were calcinated at 900 C-omicron for 2 h and the samples were sintered at 1200 and 1300 C-omicron for 5 h in air. The bulk density of samples was 5.07 and 4.96 g/cm(3), respectively. The microstructure of samples was observed using a scanning electron microscope. The electrical resistance was measured in a temperature programmable furnace between 25 and 85 C-omicron. The electrical resistivity of the Ni0.5Co0.5Cu0.3Zn0.3Mn1.4O4 sample increased from 52 Omega cm to 95 Omega cm when the sintering temperature increased from 1200 to 1300 C-omicron. The material constant "B", sensitivity coefficient "alpha" and activation energy "E-a" values were also calculated for the NTC thermistors.