J. Phys. I France
Volume 5, Numéro 4, April 1995
Page(s) 525 - 532
DOI: 10.1051/jp1:1995145
J. Phys. I France 5 (1995) 525-532

Young's Modulus and Internal Friction of Yttrium

A.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 $f\sim 1$ kHz. It was found that $E_{\rm bp}=134$ GPa and $E_{\rm c}=51$ 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 $\Theta_{\rm D}=135$ K and $\Theta_{\rm D}=98$ 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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