LaNiO_3 conducting particle dispersed NiMn_2O_4 nanocomposite NTC thermistor thick films by aerosol deposition

摘要

Nickel manganite spinel (NiMn_2O_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_2O_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_2O_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_2O_4 films, while retaining the high B constant of NiMn_2O_4 of over 5000 K when 25 vol.% LaNiO_3 was used without any post thermal treatment.