Abstract
High-temperature phases of ZrO 2 were obtained at room temperature by incorporating a few mole fractions of other oxides (MgO, Y 2O 3 or CoO) in a zirconia crystal lattice using high-energy ball-milling. Raman spectra obtained after an adequate period of ball-milling show the formation of ZrO 2MgO and ZrO 2Y 2O 3 cubic solid solutions and a ZrO 2CoO tetragonal solid solution. However, in the case of pure monoclinic zirconia, the transformation from a monoclinic to a tetragonal structure could not be completed by the use of ball-milling only. The spectra of fully stabilized solid solutions did not change essentially with laser power, while insufficiently milled samples underwent phase changes when the laser power increased. In pure milled zirconia, annealing effects were observed.
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