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Synchrotron X-ray powder diffraction and extended X-ray absorption fine structure spectroscopy studies on nanocrystalline ZrO2–CaO solid solutions
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fabregas, I. Lamas, Diego Germán Reca, Noemí E. Walsöe De Fantini, Marcia C. A. Craievich, Aldo Felix Prado, Rogério Junqueira |
| Copyright Year | 2008 |
| Abstract | The crystal structure and the local atomic order of a series of nanocrystalline ZrO2–CaO solid solutions with varying CaO content were studied by synchrotron radiation X-ray powder diffraction and extended X-ray absorption fine structure (EXAFS) spectroscopy. These samples were synthesized by a pH-controlled nitrate–glycine gel-combustion process. For CaO contents up to 8 mol%, the t′ form of the tetragonal phase (c/a > 1) was identified, whereas for 10 and 12 mol% CaO, the t′′ form (c/a = 1; oxygen anions displaced from their ideal positions in the cubic phase) was detected. Finally, the cubic phase was observed for solid solutions with CaO content of 14 mol% CaO or higher. The t′/t′′ and t′′/cubic compositional boundaries were determined to be at 9 (1) and 13 (1) mol% CaO, respectively. The EXAFS study demonstrated that this transition is related to a tetragonal-to-cubic symmetry change of the first oxygen coordination shell around the Zr atoms. |
| Starting Page | 680 |
| Ending Page | 689 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| DOI | 10.1107/S0021889808013046 |
| Volume Number | 41 |
| Alternate Webpage(s) | http://journals.iucr.org/j/issues/2008/04/00/ks5166/ks5166.pdf |
| Alternate Webpage(s) | https://doi.org/10.1107/S0021889808013046 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
