Abstract
The internal friction and shear modulus of a series of Nd x Y 1− x Ba 2Cu 3O y ( x = 0.0–1.0) superconductors were measured over the temperature range of 300–700 K at frequencies of 0.032–10.0 Hz using a forced torsional vibration method. Anelastic relaxation peaks due to oxygen migration were observed at temperatures from 410 to 520 K. The Arrhenius plots of logarithmic relaxation time versus inverse peak temperature for the internal friction peaks showed an unsystematic shift with an increase in the neodymium composition, while changes of the average cell structure exhibited a linear relationship when plotted versus the average ionic radius for trivalent rare earth ions with the coordination number eight.
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