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Structural analysis on spinel (MgAl2O4) for application in spinel-bonded castables
Ceramics International, 2009Abstract An intimate mixture of common hydrated magnesium salt and cheaper boehmite sol had been used as a cost-effective precursor of reactive nanometric spinel (1:1) powder. It was gelled at controlled pH, temperature and time, and calcined at significantly lower temperature after soft mechanochemical treatment.
A. Banerjee +3 more
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Tribological Behaviour of Transparent Spinel (MgAl2O4)
2022The wear behaviour of transparent magnesium aluminate (MgAl2O4) was investigated for unlubricated sliding against chrome steel balls under different load (5, 10, and 15 N) conditions. The sliding speed and sliding distance were retained constant, i.e., 260 mms-1 and 157 m, respectively.
Divyansh Mittal +3 more
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Dynamic response of transparent ceramic MgAl2O4 spinel
Scripta Materialia, 2011The quasistatic and dynamic compressive strengths of transparent spinel (MgAl2O4) specimens with grain sizes of 0.4 and 1.4 μm are measured. The measured strengths and rate sensitivities of the spinel specimens are compared with another transparent ceramic material, AlON, with significantly coarser grains.
J. Kimberley, K.T. Ramesh
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Interaction of MgAl2O4 and MgCr2O4 spinels with calcoferruginous melts
Refractories, 1969The interaction was studied between MgAl2O4 and MgCr2O4 spinels (and their solid solutions and compositions with periclase) with calcoferruginous melts, which are the essential constituents of various slag reagents.
Ya. V. Klyucharov, N. V. Meshalkina
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Slip Systems in Stoichiometric MgAl2O4 Spinel
1975The mechanical properties of stoichiometric MgAl2O3 spinel single crystals have been investigated at high temperatures (∿1800°C). The slip system has been determined by slip trace analysis and electron microscopy to be {111} . This behavior is rationalized by analyzing the changes in atomic configuration around dissociated dislocations as they move ...
L. Hwang, A. H. Heuer, T. E. Mitchell
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Spectroscopic properties of Nd3+ in MgAl2O4 spinel nanocrystals
Journal of Alloys and Compounds, 2012Abstract Nd 3+ doped MgAl 2 O 4 spinel nanocrystals have been prepared by the sol–gel method. Their size decreases from 12 to 7 nm with increasing Nd 3+ concentration from 0.1 to 5%, respectively. Some crystal field components of the Nd 3+ energy levels in MgAl 2 O 4 spinel were found from the 300 K reflectance absorption and the 77 K emission ...
P.J. Dereń +3 more
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The Brittle to Ductile Transition In MgAl2O4 Spinel
1995The brittle to ductile transition in ceramic materials is often referred to as the ductile to brittle transition in the metallurgical literature.1–4 It has been a topic of interest in crystalline ceramics for nearly half a century, since the early efforts to develop “ductile” ceramics in the 1950’s. Although there have been efforts to address the topic
Ronald L. Stewart, Richard C. Bradt
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Piezo- and thermo-optic behavior of spinel (MgAl2O4)
Journal of Solid State Chemistry, 1975Abstract The piezo- and thermo-optic properties of oxides are extremely interesting and fascinating, since in some oxides such as vitreous silica, α-quartz, etc., the refractive index increases with hydrostatic pressure, while in some others such as MgO, SrTiO 3 , α-Al 2 O 3 , etc., it decreases with pressure.
K. Vedam, J.L. Kirk, B.N.N. Achar
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Construction of hierarchical MgAl2O4 spinel as catalytic supports
Materials Letters, 2015Abstract Two types of nanostructures for MgAl 2 O 4 spinel were reported, the hollow spheres and 3D hierarchical structures assembled from 2D thin nanosheets. The achieved materials are highly uniformed in morphologies and the 3D hierarchical MgAl 2 O 4 owns a relatively large specific surface area of 180 m 2 g −1 . The application of the obtained
Bin Ren +4 more
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Influence of the synthesis route on MgAl2O4 spinel properties
Journal of Materials Chemistry, 2001MgAl2O4 spinels were synthesized either from an oxide mixture (MgO and Al2O3) or a sulfate mixture (MgSO4·7H2O and NH4Al(SO4)2·12H2O) at temperatures of 1000 to 1600°C for heating times ranging from 2 to 14 hours. The crystallinity of as-synthesized samples was determined by X-ray diffraction.
Laurence Schreyeck +2 more
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