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Tetragonal zirconia doped with 3 mol% ErtOj was prepared by the gel-precipitation wet-chemical method. The compaction response of ultrafine (-8.5 nm), calcined, deagglomerated powders was studied. Initial sintering was studied using both isothermal and nonisothermal techniques, and an activation energy of 270 k 40 kJ/mol was obtained; therefore, grain-boundary diffusion was probably the predominant mechanism in the sintering stage. The microstructural development in the high-temperature-aged, sintered samples and its effect on density and mechanical properties were also studied. A theoretically dense body of tetragonal zirconia solid solution of 3 mol% Er2O3-ZrO2, obtained from sintering below 1400"C, was translucent. [

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