Elastic properties of a high purity gadolinium single crystal

The temperature dependence of Young's modulus (E-c and E-b) and the interna l friction have been measured in a high-purity gadolinium single crystal al ong the c- and b- axis in the-temperature range of 4.2-350 K at the frequen cies of 800-1200 Hz. At 4.2 K the values of E-c and E-b are equal to 7.25 x 10(11) and 6.14 x 10(11) dyn/cm(2), respectively. The lattice part of Youn g's modulus has been calculated. The origin of Young's modulus anomalies at the Curie temperature and in the temperature region near 140 K are discuss ed. (C) 1999 Elsevier Science B.V. All rights reserved.