Monosized, spherical Yz03 was processed from raw cornmercia1 Y203 by homogeneous precipitation in aqueous solution via urea decomposition. Dry-pressed pellets of the synthesized and raw powders were sintered to 1500", 1600", and 1700°C for 7 to 720 min. Microstructural development was followed with scanning electron microscopy. The differences between sintering behavior of the two powders are discussed.