Structural and Electrical Properties of CoxMn3-xO4 Ceramics for Negative Temperature Coefficient Thermistors

초록

CoxMn3-xO4 (1.48 <= x <= 1.63) ceramics were fabricated using the solid-state reaction method. Structural and electrical properties of specimens based on the composition ratio of Co were observed in order to investigate their applicability in NTC thermistors. All specimens showed a single spinel phase with a homogeneous tetragonal structure. The Co1.57Mn1.43O4 specimen showed a maximum average grain size of approximately 6.47 mu m. In all specimens, TCR properties displayed excellent characteristics of over -4.2%/degrees C. The resistivity at 298 K and B-value of the Co1.57Mn1.43O4 specimen were approximately 418 Omega-cm and 4300, respectively.

키워드