Nanometric tetragonal and monoclinic zirconia was synthesized from zirconyl chloride by the modified forced hydrolysis method. Phase transitions and morphological changes accompanying zirconia
calcination in the temperaure range 600–1000 °C were studied by XRD, HR-TEM techniques and
N2-porosimetry. Ageing of the amorphous hydrous zirconia at 100 °C for 48 h in the mother solution and
its subsequent calcination at 600 °C for 6 h strongly favoured formation of single-phase tetragonal ZrO2
of the thermal stability enhanced by 250 °C. Influence of the calcination temperature on phase composition, grain size, grain boundaries and pore structure of the resultant ZrO2 material was analyzed.
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