Co and Fe doping effect on negative temperature coefficient characteristics of nano-grained NiMn2O4 thick films fabricated by aerosol-deposition

J Nanosci Nanotechnol. 2013 May;13(5):3422-6. doi: 10.1166/jnn.2013.7232.

Abstract

Spinel structured highly dense NiMn2O4-based (NMO) negative temperature coefficient (NTC) thermistor thick films were fabricated by aerosol-deposition at room temperature. To enhance the thermistor B constant, which represents the temperature sensitivity of the NMO thermistor material, Co and Co-Fe doping was applied. In the case of single element doping of Co, 5 mol% doped NMO showed a high B constant of over 5000 K, while undoped NMO showed -4000 K. By doping Fe to the 5 mol% Co doped NMO, the B constant was more enhanced at over 5600 K. The aging effect on the NTC characteristics of Co doped and Fe-Co co-doped NMO thick film showed very stable resistivity-time characteristics because of the highly dense microstructure.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aerosols / chemistry*
  • Cobalt / chemistry*
  • Hot Temperature
  • Iron / chemistry*
  • Materials Testing
  • Membranes, Artificial*
  • Metal Nanoparticles / chemistry*
  • Metal Nanoparticles / ultrastructure*
  • Molecular Conformation
  • Particle Size
  • Surface Properties
  • Thermal Conductivity

Substances

  • Aerosols
  • Membranes, Artificial
  • Cobalt
  • Iron