Negative Temperature Coefficient - an overview - ScienceDirect
https://www.sciencedirect.com/topics/chemical-engineering/negative-temperature-coefficient
WEB[7.3] ρ = ρ 0 × exp B / T, where ρ0 is the resistivity (Ω cm) at ‘infinite’ temperature, T is the absolute temperature and B = E a /k B is the thermistor constant (also called the beta factor or the coefficient of temperature sensitivity), E a is the activation energy for electrical conduction and k B is the Boltzmann constant.
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