Abstract
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 ∼ 1 kHz. It was found that E bp = 134 GPa and E 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 Θ D = 135 K and Θ 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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