期刊
MATERIALS RESEARCH BULLETIN
卷 44, 期 6, 页码 1301-1311出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2008.12.014
关键词
Oxides; Chemical synthesis; Mossbauer spectroscopy; X-ray diffraction
资金
- CONACYT (Mexico)
- BOF, Bijzonder Onderzoeksfonds
- UGent, Belgium [B/06633]
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 Mossbauer 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 degrees 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. (C) 2009 Elsevier Ltd. All rights reserved.
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