An innovative approach to design highly stabilized thermistor materials: dual-phase five-component CoMnFeZnYO7 ceramics

Abstract

Entropy-stabilized Oxides (ESOs) composed of multiple cations have drawn extensive research interest in recent years due to their distinctive structural characteristics and interesting functional properties induced by entropy engineering. In this work, the first multi-component CoMnFeZnYO₇ thermistor material for temperature sensing applications was synthesized via the solid-state reaction route in pursuit of higher long-term stability. The as-prepared oxide contains an intriguing dual-phase structure of cubic spinel and ortho-perovskite, and simultaneously each cation is highly homogeneously dispersed on the microscopic scale. This two-phase multi-component oxide exhibits ultra-high stability (ΔR/R₀ = 0.073%) under accelerated aging conditions of 125 °C for 500 h. The successful fabrication of such multi-component oxides with ultra-high stability brings an innovative perspective to the design and application of electronic materials.