In this study, single-phase high-entropy ceramics (HECs) with the composition (Co,Mn,Fe,Zn,Ni,Mg,Al,Cr)3O4 were successfully synthesized using five different types of spinel raw materials.The resulting material demonstrates excellent performance in the neg. temperature coefficient (NTC) thermistor field.X-ray diffraction (XRD) anal. confirmed the structure as a cubic spinel with a single Fd-3m space group.The electron microscope image reveals the growth of ceramic grains with increasing sintering temperature, with a uniform distribution of all elements.After 1800 h of accelerated aging at 150 °C, the ΔR/ R0 value was only 0.41 %, indicating the ceramic′s exceptional structural stability.XPS(XPS) anal. reveals that elec. conductivity are mainly governed by electron hopping between Mn3+ and Mn4+ ions in the octahedral sublattice sites.Impedance spectroscopy further shows that grain boundary resistance is the dominant contributor to the total resistance.This study provides new insights into the synthesis of single-phase HECs materials and proposes strategies to enhance material stability for future applications.