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Template formation of magnesium aluminate (MgAl2O4) spinel microplatelets in molten salt |
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| Authors: | Daniel Doni Jayaseelan Shaowei Zhang Shinobu Hashimoto William Edward Lee |
| Affiliation: | aDepartment of Materials, Imperial College, London SW7 2AZ, UK bDepartment of Engineering Materials, University of Sheffield, Sheffield S1 3JD, UK cDepartment of Materials and Environmental Engineering, Nagoya Institute of Technology, Nagoya 466 0064, Japan |
| Abstract: | Magnesium aluminate, MgAl2O4 (MA), microplatelets were synthesized using a molten salt technique. -Alumina platelets partially decomposed from aluminium sulphate were reacted with either commercial magnesium oxide or magnesium nitrate in the molar ratio 1:1 to synthesize spinel platelets. Molten salts such as chloride, MCl (M = Li, Na, and K) and potassium sulphate were used for MA synthesis and the salt to oxide ratio was kept at 3:1 for all compositions. Reactants and molten salt mixes were fired in an alumina crucible for 3 h at from 800 to 1150 °C. XRD revealed complete MA without formation of any secondary phase for powders fired for 3 h at 1100 °C. Electron microscopy revealed the MA platelet morphology and size was the same as the -alumina platelets indicating a ‘template process’ during molten salt synthesis. |
| Keywords: | Molten salt synthesis Platelets |
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