An accurate equation for the V?T characteristic of GaAs diode thermometers in the 4–300 K range

GaAs diode thermometers have been demonstrated to be reliable and reproducible transducers in both the liquid nitrogen and helium range, but so far no equation has been available for interpolating the voltage-temperature characteristic, at constant current, with an accuracy better than 1 K.An equation is developed: V = A + Blog_e (T/T₁ + 1) + C(log_e(T/T₁ + 1)² + …] which determines the V?T characteristic with a voltage accuracy of 0.01%, corresponding to 0.1 K on the whole 4–300 K range.