The specific features in the low-frequency internal friction, structure, and phase composition of polycrystalline ZrO2–4mol%Y2O3 were investigated at 273 to 373K. It was demonstrated that the low-frequency internal friction exhibited two peaks upon heating and cooling. The former peak was observed at approximately 293K, and the latter peak was revealed at 313K. It was assumed that the peak observed in the low-frequency internal friction at 293K was attributed to relaxation dissipation of energy during motion of twin boundaries in the monoclinic phase, whereas the peak at 313K was associated with relaxation processes due to displacement of the boundaries of tetragonal domains.

Low-Frequency Internal Friction of Polycrystalline ZrO2–4mol%Y2O3 in the Temperature Range 273–373K. G.A.Marinin, G.Y.Akimov, V.N.Varyukhin, O.N.Potapskaya: Physics of the Solid State, 2002, 44[7], 1323-6