Role of annealing temperature on cation ordering in hydrothermally prepared zinc aluminate (ZnAl2O4) spinel
| Autor: | Chinnasamy Murugesan, Prabeer Barpanda, Debasmita Dwibedi, Michal Leskes |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Aluminate chemistry.chemical_element Mineralogy 02 engineering and technology Zinc engineering.material 01 natural sciences law.invention symbols.namesake chemistry.chemical_compound Lattice constant law 0103 physical sciences General Materials Science Calcination 010302 applied physics Rietveld refinement Mechanical Engineering Spinel 021001 nanoscience & nanotechnology Condensed Matter Physics Crystallography chemistry Mechanics of Materials X-ray crystallography symbols engineering 0210 nano-technology Raman spectroscopy |
| Zdroj: | Materials Research Bulletin. 98:219-224 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2017.10.010 |
| Popis: | Spinels (AB 2 O 4 ) form a niche class of ceramics, which is rich in structural (dis)ordering due to the inherent mixing between the constituent tetrahedral and octahedral sites. The cations (A and B) can form antisite defects under the influence of external parameters like pressure, temperature and nuclear irradiation. The current study reports the formation and evolution of disorder-order structural transition in hydrothermally prepared zinc aluminate spinel ZnAl 2 O 4 . The effect of final calcination temperature (300–900 °C for 9 h) on the degree of cation ordering has been investigated with powder X-ray diffraction, Raman and 27 Al solid-state NMR spectroscopy. Rietveld refinement revealed a gradual disorder to order structural transition accompanied by lower inversion parameter ( i s ) and smaller lattice parameter ( a ) with higher calcination temperature. It was further affirmed by Raman analysis and solid-state NMR spectroscopy probing the ZnO 4 and AlO 4 tetrahedra in spinel. Independent of the degree of cation ordering, nanometric particle size with high surface area was observed in ZnAl 2 O 4 spinel. |
| Databáze: | OpenAIRE |
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