Internal friction of polycrystalline Zr 0.8R 0.2O 1.9 (R = Nd, Y)

Abstract

The oxygen relaxation in two cubic zirconias, Zr 0.8R 0.2O 1.9 where R = Nd and Y, was compared with internal friction in the temperature range of 300–685 K using forced torsion pendulum method. The internal friction of Zr 0.8Nd 0.2O 1.9 was shown as a single peak at around 350–450 K at frequencies of 0.32–9 Hz. The activation enthalpy of relaxation in Zr 0.8Nd 0.2O 1.9 was determined to be 1.12 ± 0.1 eV. The amplitude of the high-temperature peak in Y-doped zirconia was not observed for Zr 0.8Nd 0.2O 1.9. The result suggests that the relatively lower mobility of oxygen is due to the doping of larger Nd cation to ZrO 2 lattice.