LaNiO3 conducting particle dispersed NiMn2O4 nanocomposite NTC thermistor thick films by aerosol deposition

Abstract Nickel manganite spinel (NiMn 2 O 4 ) based negative temperature coefficient (NTC) thermistors have good thermistor characteristics and stabilities. However, to achieve thermistors with a high B constant, the activation energy should be high, which results in high room temperature (RT) resistivity. To obtain a high B constant and low RT resistivity, NiMn 2 O 4 based nanocomposite thick films with the conducting metal oxide, LaNiO 3 , were fabricated on a glass substrate by aerosol deposition at room temperature. The NiMn 2 O 4 –LaNiO 3 nanocomposite thick films showed an RT resistivity as low as 35 kΩ cm, which is one order of magnitude lower than that of the NiMn 2 O 4 films, while retaining the high B constant of NiMn 2 O 4 of over 5000 K when 25 vol.% LaNiO 3 was used without any post thermal treatment.