The electrical resistivity of magnesium at room temperature was found to increase by 1.47±0.37 &mgr;&OHgr; cmper atomic percent addition of neodymium. The additional resistivity is strongly temperature dependentbetween 77° and 373°K. In the temperature range 273° to 373°K the temperature dependence of the additionalresistivity can be characterized by a temperature coefficient of the order−2×10−3 deg−1.