Fabrication and Electrical Properties of Mn–Ni–Co–Cu–Si Oxides Negative Temperature Coefficient Thermistors

Abstract

The microstructure and electrical properties of Mn–Ni–Co–Cu–Si oxides negative temperature coefficient (NTC) thermistors were studied. The as‐sintered (Mn1.62Ni0.72Co0.57−x CuxSi0.09)O4 (0≤x≤0.12) and (Mn1.2Ni0.78Co0.87−xCu0.15Six)O4 (0≤x≤ 0.15) ceramics showed the solid solutions of Mn–Ni–Co–Cu–Si oxides with a cubic spinel structure. The addition of SiO2 led to an increase in the temperature coefficient of resistivity. This demonstrates that the SiO2 addition is desirable for developing highly sensitive NTC thermistors. In addition, the resistivity and the temperature coefficient of resistivity for (Mn1.62Ni0.72Co0.57−xCuxSi0.09)O4 and (Mn1.2Ni0.78Co0.87−x Cu0.15Six)O4 NTC thermistors were controlled by changing the composition.

Electrical properties of Sr–Bi–Mn–Fe–O thick-film NTC thermistors prepared by screen printing

“…On the basis of the resistivity data of the Sr-Bi-Mn-Fe-O thick-film system, it is clear that the values of 25 and the B 25/85 constant can be adjusted with different compositions. Furthermore, the film conductivity can also be explained by the following charge transport process [13,14] The thermistor parameters of sample B2 sintered at different temperatures is shown in Table 2. The films sintered at temperatures 780-790 • C show low room-temperature resistivity, compared with those over or below the sintered temperature range.…”

Effect of La2O3 Addition on Copper‐Nickel Manganese Thermistors for Low‐Temperature Applications

“…The incorporation of a tiny amount of La 2 O 3 exhibited a much increased resistivity without causing much change in the B value. 18 In all samples, the conduction is mainly caused by the hopping of electrons between Mn 3+ to Mn 4+ on octahedral sites and also the Cu ions participate in the transfer process in the form of instantaneous Cu + quasi-stable state at the octahedral site. Perovskite-structured LaMnO 3 is a good electronic conductor with the electrical resistivity of <3 ΩÁcm.…”

NİKEL MANGANİT ESASLI NTC TERMİSTÖRLERİN ELEKTRİKSEL ÖZELLİKLERİNE 0.15 VE 0.3 MOL CuO KATKISININ ETKİSİ

“…Sinterlenme işlemi sonrasında numunelerin yığın yoğunluk değerleri Arşimed Metodu kullanılarak hesaplanmıştır (Bengisu 2001 ile hesaplanmıştır. Burada "kb " ile ifade edilen Boltzmann sabitidir ve 8.617 x 10 −5 eV değerindedir (Park, 2005).…”