(a) XPS spectrum of YCrO3 ceramic material Cr2p; (b) lnÏ-1000/T pattern of YCr1-xMnxO3 NTC thermistor Negative temperature coefficient (NTC) thermistor's main characteristics are high temperature sensitivity, fast response, stable performance, but also has the advantages of small size, simple structure, it is widely used in temperature measurement, temperature control, temperature compensation, suppression of surge Current and other devices. Due to its magnetoelectric properties, YCrO3 perovskite materials have been widely used in high temperature electrodes, thermoelectrics, magnetoelectric materials and other fields. Among them, YCr1-xMnxO3 (0≤x≤0.5) materials with orthorhombic perovskite structure have excellent electrical properties and are considered as potential NTC thermistor materials. However, the problems of the conductive mechanism and the ionic interaction mechanism of the materials in this system have not been completely solved, and there are few reports. Xu Aimin, a researcher at the Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences, led his team to study the electrical properties of YCr1-xMnxO3 (0≤x≤0.5) and found that the material resistivity increases first and then decreases with increasing Mn doping amount. Abnormal rate phenomenon; through the use of defect chemical theory combined with X-ray photoelectron spectroscopy analysis, revealed the abnormal conductivity of the material mechanism. The YCrO3 material is a p-type semiconductor, the resistivity is mainly determined by the Cr4+ ion concentration, and the Mn ion is used as an n-type dopant to compensate for metal vacancies, resulting in a decrease in the Cr4+ ion concentration and an increase in the resistivity; as the Mn content increases from 0.2 to At 0.5, Mn4+ ions increase, which promotes the electron jump between Mn3+ and Mn4+, resulting in an increase in carrier concentration and a decrease in resistivity. The proposal of the conductance mechanism provides a theoretical basis for further design and synthesis of novel NTC thermistor materials through atmosphere control and ion doping. The research results have been published online in Applied Physics Letters. The research work was funded by the National Natural Science Foundation of China and the National “863†project. Hebei Haiao Wire Mesh Products Co., Ltd. , https://www.haiaowiremeshfencing.com