An efficient way to improve the electrical stability of Ni0.6Si0.2Al0.6Mn1.6O4 NTC thermistor

In this paper, Ni0.6Si0.2Al0.6Mn1.6O4 compounds with negative temperature coefficient (NTC) property were fabricated using NiO, SiO2, MnO2 and Al2O3 as raw materials. The effect of ball milling time on phase composition, microstructure and electrical stability of the compounds was studied. The results showed that the particle size of calcined powder decreased with the increase of ball-milling time, resulting in a decreased B25/85 constant, activation energy and resistance drift ΔR/R0 (%) of the Ni0.6Si0.2Al0.6Mn1.6O4 compounds. Meanwhile, it was found that activation energy increased with the decrease of the density of the compounds, and the resistance drift ΔR/R0 (%) was less than 0.02% when the ball-milling time reached to 48 h.