MgO (10.4 mol%)‐doped ZrO 2 powder, which was prepared by coprecipitation and calcination at 750°C, was leached and milled, respectively. The powders were characterized by Auger electron scanning microprobe and XRD technologies. Only the 2.3 mol% MgO was soluble in ZrO 2 ; it stabilized ZrO 2 as the metastable tetragonal phase (crystallite size ∼45 nm) at room temperature. The rest of the MgO (8.1 mol%) existed on the surface of the ZrO 2 grains in the prepared powder.
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Rong et al. (2002) studied this question.
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