J. Phys. I France 5 (1995) 525-532
Young's Modulus and Internal Friction of YttriumA.M. Tishin, S.A. Nikitin and V.Yu Bodriakov
Physics Department of Moscow State University, Moscow, 119899, Russia
(Received 2 September 1994, received in final form 22 November 1994, accepted 15 December 1994)
A detailed study of the temperature dependence of Young's modulus E(T) and internal friction Q-1(T) has been made for various purity single crystals and polycrystalline samples of yttrium. Measurements have been carried out in the temperature range 4.2-400 K at frequencies kHz. It was found that GPa and GPa at T=4.2 K in the basal plane and along the c-axis, respectively. It was established that the E(T) curves for single crystals have a Debye-like shape in the temperature interval 4.2-320 K (the Debye temperature K and K in the case of basal plane and the c-axis, respectively. Q-1(T) at a temperature near 400 K displays maxima connected with relaxation processes of defects and dislocations in the samples.
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