Electrical resistivity of La

The electrical resistivity of high-purity double hexagonal-close-packed (dhcp) α-La from 5 to 300 K is reported. Measurements were made on small-grained samples prepared by heat treatment of eold-worked lanthanum. Measurements were also made on samples cut in different directions from an ingot slowly cooled from the molten state. The room-temperature results were all within 2% of the mean value. Chemically pure β-La (fcc) cannot be retained at room temperature, hence, measurements were made on an fcc sample of La containing 0.2-at.% Gd and {~} 0.8-at.% total interstitial nonmetallic impurities. The cubic form has almost the same type of temperature dependence as the dhcp form, but has a 10% lower magnitude.