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Internal Friction near the Orthorhombic-to-Tetragonal Phase Transition in YBa2Cu3O7-x at 80–200 kHz

The internal friction and compliance of YBa2Cu3O7-x are measured at temperatures from 300 to 1050K using a LiNbO3 composite oscillator technique. An anelastic relaxation due to oxygen movement at 80–200 kHz is observed to be associated with the orthorhombic-to-tetragonal (O-T) phase transition in YBa2Cu3O7-x at 850–900 K. By careful fitting for the measured internal friction against temperature, we provide data on the relaxation time and peak temperature in the highest frequency region for a linear Arrhenius plot that extends over 7 orders of magnitude.