Recent progress in the fabrication of ceramic negative temperature coefficient thermistors

Effect of annealing in O2 or N2 on the aging of Fe0.5Mn1.84Ni0.66O4 NTC-ceramics

“…Negative temperature coefficient (NTC) ceramic thermistors are increasingly used in various industrial and domestic applications, such as elements for suppression of in-rush currents, for temperature measurement and control, and for the compensation of other circuit elements [1]. The specific resistivity of these ceramics follows the well known Arrhenius relation: ρ = ρ 0 exp(E a / kT), in which ρ is the specific resistivity, E a the activation energy for electrical conduction, k Boltzmann's constant and T the absolute temperature.…”

Electronic Functionality of Nanocomposites

“…In contrast, the thermal sensitivity of carbon nanocluster composite films remains constant over a wide temperature range due to the minimum aggregation of such clusters thereby reducing the intraparticle scattering (Murugaraj et al, 2006a and. and 3000 K to 4000 K respectively (Rousset et al, 1994). Such differences in performance arise from the lower activation energies for electron transport associated with carbon nanocomposite films.…”

A Wide Angle X-Ray Scattering (WAXS) Study of Nonstoichiometric Nickel Manganite Spinels NiMn2□3δ/4O4+δ

“…Mn>> redox couples on the same lattice sites. These couples are the cause of the good electrical conductivity of nickel manganites (normal manganite spinels are all insulators) and these materials have been widely studied for their application as thermistor ceramics (7)(8)(9). For x"1, the cation distribution would be Mn>[Ni>Mn>]O\ , but this arrangement does not account for the good conductivity of this oxide, which implies that a part of Ni> cations must be in tetrahedral sites.…”