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Micrometer size polydispersed spheres of zirconia were produced via electrostatic atomization and pyrolysis of aqueous zirconium acetate‐yttrium acetate precursors. Varying the precursor composition in the ZrO 2 ‐rich region of the ZrO 2 ‐Y 2 O 3 binary system resulted in the production of either single‐crystal (0 and 10 mol% Y 2 O 3 O or dense polycrystalline (3 mol% Y 2 O 3 ) zirconia spheres of similar size distribution for densification studies. Powders of either the singlecrystal or the polycrystalline particles exhibited contrasting densification behavior; viz., powder compacts composed of polycrystalline particles obtained significantly higher endpoint densities than their single‐crystal counterparts. Microstructural observations showed that while necks between single‐crystal particles reached a stable size, necks between polycrystalline particles continued to grow.
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Slamovich et al. (1990) studied this question.
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