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Textures formed by phase separation and crystallization of sol–gel derived ZrO 2 –SiO 2 materials with 30 mol% ZrO 2 , were examined by X-ray diffraction, small angle X-ray scattering and transmission electron microscopy. An amorphous phase separation consisting in silica-rich and zirconia-rich interconnected domains was shown to be present before crystallization. In the initial stage crystallization of metastable tetragonal zirconia, nucleation was considered to occur in the ZrO 2 -rich regions. The size and spatial distribution of crystalline particles, dispersed in the amorphous SiO 2 -rich matrix, are controlled by the phase separation texture. |
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