Characterization of nickel manganite NTC thermistor films prepared by aerosol deposition at room temperature

Titelangaben

Schubert, Michaela ; Münch, Christian ; Schuurman, Sophie ; Poulain, Veronique ; Kita, Jaroslaw ; Moos, Ralf:
Characterization of nickel manganite NTC thermistor films prepared by aerosol deposition at room temperature.
In: Journal of the European Ceramic Society. Bd. 38 (2018) Heft 2 . - S. 613-619.
ISSN 0955-2219
DOI: https://doi.org/10.1016/j.jeurceramsoc.2017.09.005

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Abstract

NiMn2O4+δ thermistor thick films have been successfully deposited by the so-called Aerosol Deposition Method (ADM) at room temperature on alumina substrates, Si-wafers, as well as on special planar four-wire interdigital electrode structures for high-precision electrical characterization. The NTCR films are homogeneous, completely dense and scratch resistant. Both as-deposited and tempered, the NTCR films exhibit a cubic spinel structure. Between 25 °C and 90 °C, the NTCR film resistance behaves as it is typical for variable range hopping (VRH) with parabolic density of states. As a result of moderate film tempering, the thermistor constant B and the specific resistance at 25 °C (ρ25) decrease from 4250 K to 4020 K and 65 Ω·m to 40 Ω·m respectively, and are close to bulk values. In combination with the excellent reproducibility of the ρ25 and B values, AD processing of films appears to be a promising alternative for classical ceramic bulk processes.