Martensitic transformation of lithium: Magnetic susceptibility measurements

The magnetic susceptibility of lithium has been measured at 78 K both before and after cooling to 4 K to initiate the martensitic phase transformation. The susceptibility increases on the initial transformation by 7--26 %, but this becomes systematically less for successive transformation cycles until no effect of cycling can be seen, in disagreement with previous bulk measurements. The magnetic change reverts rapidly up to about 120 K but then shows a prominent tail up to about 170 K, which may be due to the fcc phase during the reversion. A large residual-resistance annealing peak has been observed between 110 and 160 K, which correlates with the phase reversion.