ELASTIC PROPERTIES OF TERBIUM

The temperature dependence of the Young modulus along the crystallogra phic axes b and c (E(b) and E(c)), and the internal friction of a terb ium single crystal have been measured. At 4.2 K, E(b) and E(c) are equ al to 38 and 84.5 GPa, respectively. The lattice part of the Young mod ulus and the Debye temperature has been calculated. The origin of the Young modulus anomalies arising at the transition to the magnetically ordered state is discussed.