Effect of Al2O3 addition on the microstructure and electrical properties of LaMnO3-based NTC thermistors

Bismuth trioxide-tailored sintering temperature, microstructure and NTCR characteristics of Mn1.1Co1.5Fe0.4O4 ceramics

“…Further, as Bi 2 O 3 increased from 0 to 0.15 wt%, Z 0 decreases rst and then increases, which corresponds to the variation of the microstructure and densication. Similar results reported by Zhang et al 36 Fig. 11 presents the relation of the imaginary part (Z 00 ) with frequency.…”

Fast response and high stability Mn–Co–Ni–Al–O NTC microbeads thermistors

“…71‐0852) solid with Fd3 m symmetry. Both for A1 and A2 samples, the diffraction peaks shifted to higher angles due to changes in the ionic of the Al 3+ (0.535 Å for 6‐coordation) and Mn 3+ (0.645 Å for 6‐coordation) 14 …”

“…changes in the ionic of the Al 3+ (0.535 Å for 6-coordation) and Mn 3+ (0.645 Å for 6-coordation). 14 SEM images of MCNA ceramic microbeads are shown in Figure 3A-D. The overall size of ceramic microbeads sintered at 1250°C was 160 μm, as seen in Figure 3A.…”

Correlation between B value deviation and sintering temperature of perovskite solid solution materials

“…This is exactly the same as the Arrhenius equation:where ρ 0 is the resistivity at infinite temperature. E a is the activation energy for electrical conduction and k the Boltzmann's constant (Table ) . From Figure A‐F we can get the following information: (i) The relationship between B value and LCM content was abnormal at the sintering temperature of 1300°C.…”

“…E a is the activation energy for electrical conduction and k the Boltzmann's constant ( Table 2). 22 From Figure 3A-F we can get the following information: (i) The relationship between B value and LCM content was abnormal at the sintering temperature of 1300°C. (ii) Increasing the sintering temperature from 1200°C to 1275°C has little effect on the B value (LCM content increased It is well known that perovskite is formed by a shorter A-site cation radius and a longer B-site cation radius.…”