The electron behavior in metals varies with temperature and is largely reflected by the electron work function. A theoretical model for predicting the temperature dependence of the electron work function, developed by Rahemi et al. explains the underlying mechanism and predicts this temperature dependence for various crystal structures via calculable and measurable parameters. In general, as the temperature increases, the EWF decreases via φ φ ( T ) = φ φ 0 − − γ γ ( k B T ) 2 φ φ 0 and γ γ is a calculable material property which is dependent on the crystal structure (for example, BCC, FCC). φ φ 0 is the electron work function at T=0 and k B is constant throughout the change.