Synthesis and characterization of nanocrystalline MgAl2O4 spinel by polymerized complex method |
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| Authors: | P.Y. Lee H. Suematsu T. Yano K. Yatsui |
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| Affiliation: | (1) Extreme Energy–Density Research Institute, Nagaoka University of Technology, 1603-1 Nagaoka, Niigata 940-2188, Japan;(2) Research Lab for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1 O-okayama, Tokyo Meguro-ku, 152-8550, Japan |
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| Abstract: | Ultrafine MgAl2O4 powder has been synthesized by a polymerized complex method. Heating of a precursor solution containing citric acid (CA), ethylene glycol (EG) and Mg and Al salts with a molar ratio of Mg/Al/CA/EG=1/2/8/32 at 180°C produced a transparent polymeric gel, which have been characterized by FT-IR spectroscopy and TG/DTA. The organic fraction was removed by controlled thermal treatments (350–1200°C) whereby the bimetallic oxide was formed. XRD analysis showed the presence of MgAl2O4 at 600°C. TEM observation showed that the spherical nanosized powders with good uniformity was obtained. Furthermore, these powders showed excellent sinterability, relative density up to 99.8% was achieved when sintered at 1550°C for 3 h in air without any sintering additive. |
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| Keywords: | MgAl2O4 nanopowders polymerized complex method thermal treatment |
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