Authors:
P. Bar-On Department of Chemistry, Practical Engineering College, P.O. Box 45, Beer-Sheva, Israel

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I. Lin Department of Mineral Engineering, Technion-Israel Institute of Technology, 32000 Haifa, Israel

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S. Nadiv Department of Materials Engineering, Technion-Israel Institute of Technology, 32000 Haifa, Israel

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M. Melamud 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.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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