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Auto ignition synthesis of nanocrystalline MgAl2O4 and related nanocomposites

Published online by Cambridge University Press:  31 January 2011

S. Bhaduri ,
S. B. Bhaduri  and
K. A. Prisbrey
S. Bhaduri
Affiliation:
Department of Metallurgical Engineering, University of Idaho, Moscow, Idaho 83844–3024
S. B. Bhaduri
Affiliation:
Department of Metallurgical Engineering, University of Idaho, Moscow, Idaho 83844–3024
K. A. Prisbrey
Affiliation:
Department of Metallurgical Engineering, University of Idaho, Moscow, Idaho 83844–3024
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Abstract

Nanocrystalline powders of various compositions in the Al2O3–MgO binary system were synthesized using a novel “auto ignition” process. The respective nitrates were used as starting materials and urea as fuel. Thermodynamic calculations of the adiabatic temperatures were performed for various compositions from Al2O3-rich to the MgO-rich side of the phase diagram. The combustion temperatures of the different compositions were also determined experimentally. The as-synthesized powders were characterized by x-ray diffraction (XRD) and transmission electron microscopy (TEM). As a result of processing, spinel, alumina, magnesia, and solid solutions/ nanocomposites thereof formed. Grain sizes and the lattice parameter were calculated based on XRD results. Where appropriate, the lattice parameter versus the composition of these solid solutions satisfied Vegard's law. Spinel grains were in the 13–20 nm range, alumina grains were 30–40 nm, and MgO grains were 2–28 nm. The grain sizes calculated from XRD results were in good agreement with the TEM results.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 9 , September 1999 , pp. 3571 - 3580
Copyright
Copyright © Materials Research Society 1999

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