Formation of partially inverse Mg−Al spinel by grinding MgO with γ-Al2O3 |
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| Authors: | P Bar-On I J Lin S Nadiv M Melamud |
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| Institution: | (1) Department of Chemistry, Practical Engineering College, P.O. Box 45, Beer-Sheva, Israel;(2) Department of Mineral Engineering, Technion-Israel Institute of Technology, 32000 Haifa, Israel;(3) Department of Materials Engineering, Technion-Israel Institute of Technology, 32000 Haifa, Israel;(4) Nuclear Research Center-Negev, P.O. Box 9001, Beer-Sheva, Israel |
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| Abstract: | Spinel (MgAl2O4) was synthesized mechanochemically (MC) by grinding MgO with γ-Al2O3 up to 10 hours. Examination of the MC product by neutron diffraction and infrared spectroscopy showed that it has a higher
degree of inversion than its thermally produced counterpart—47% as against 10% respectively. X-ray studies showed that MgAl2O4 crystallites grow equidimensionally at a much higher rate than in the case of α-Al2O3. The higher degree of inversion and higher formation rate when γ-Al2O3 is used, is attributed to similarities in oxygen framework of MgO, Al2O3 and spinel and to the higher retention of the cations coordination number. The equidimensional growth is attributed to the
presence of multiple soft modes, the {111} planes.
Deceased. |
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| Keywords: | Mg− Al spinel |
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