The Internal Friction of Yttria Stabilized Zirconia with Large Amount of Oxygen Vacancy

Abstract

We examined the internal friction (IF) behavior of Y₂O₃-stabilized ZrO₂ with a large amount of oxygen vacancy by using forced torsion method in the temperature range of 25∼420°C. In the polycrystalline Zr_1-xY_xO_2-x/2 (x = 0.3 and 0.5), a single and broad IF peak was observed at around 150∼350°C. The analysis of IF peak suggested that the internal friction was induced by the relaxation of oxygen vacancy in the local structure. Also, the formation of locally immobile coordination of vacancy was suggested by the IF amplitude for heavily defective cubic zirconia.