Abstract
In the ZrO 2-Y 2O 3 system, metastable ZrO 2 solid solutions containing up to ≈46 mol% Y 2O 3 crystallize at low temperatures from amorphous materials prepared by the simultaneous hydrolysis of zirconium isopropoxide and yttrium acetylacetonate: t- and c-ZrO 2 phases below and above 8 mol% Y 2O 3, respectively. The variation of the lattice parameters of both phases is determined as a function of Y 2O 3 content. The value of the lattice parameter of pure ZrO 2 (tetragonal) is a=0.5085 nm and c=0.5170 nm. Powder characterization has been examined using c-ZrO 2 solid solution powders prepared in the composition of ZrO 2 Y 2 O 3= 80 20 mol% . Crystallite size, particle size and particle morphology are strongly dependent on heating temperature. Surface areas of powders do not drop below 10 m 2/g until the heating temperature is above 900°C.
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