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Iron-stabilized nanocrystalline ZrO2 solid solutions: Synthesis by combustion and thermal stability

2009; Elsevier BV; Volume: 44; Issue: 6 Linguagem: Inglês

10.1016/j.materresbull.2008.12.014

1873-4227

Felipe Legorreta García, Valdirene Gonzaga de Resende, E. De Grave, Alain Peigney, Antoine Barnabé, Christophe Laurent,

Zeolite Catalysis and Synthesis

The synthesis of Fe3+-stabilized zirconia by the nitrate/urea combustion route was investigated. Using several characterization techniques, including X-ray diffraction, field-emission-gun scanning electron microscopy and notably Mössbauer spectroscopy, it was possible to determine the appropriate amount of urea that allows to obtain a totally stabilized Zr0.9Fe0.1O1.95 solid solution. The nanocrystalline zirconia solid solution is mostly tetragonal, but the presence of the cubic phase could not be ruled out. An in-depth study of the thermal stability in air showed that the Fe3+ solubility in the stabilized solid solution starts to decrease at about 875 °C which results in the formation of hematite (possibly containing some Zr4+) at the surface of the zirconia grains and further provokes the progressive transformation into the monoclinic zirconia phase.