Abstract
The dependences of the thermometric properties of a rhodium - iron (RhFe) (mole fraction 0.5%) wire resistance thermometer on the annealing temperature between 700 and 900°C are investigated using fused-silica coil frames. The thermometers annealed at or above 800°C have similar temperature - resistance characteristics. These thermometers can be calibrated with an accuracy of 0.5 mK over the range 4.2–25 K using a reference temperature - resistance function and three calibration points. RhFe wire thermometers from different origins can be calibrated with an accuracy of the order of 10 mK in the same way. The temperature rise of the present thermometers due to heating by the measuring current is in a reasonable range for thermometry with a millikelvin accuracy.
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