Results 161 to 170 of about 5,849 (219)

Ultra-Strong Transparent ZnAl₂O₄ Glass-Ceramics via Controlled Crystallization and Ion Exchange. [PDF]

Materials (Basel)
Veselov I, Shakhgildyan G, Savinkov V, Golubev N, Tregubov K, Vinogradov D, Avakyan L, Ojovan M, Ghosh M, Sigaev V.   +9 more
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SO2 abatement over nanocrystalline MgAl2O4 spinel-supported catalysts

Journal of Porous Materials, 2012
Thermally stable magnesium-rich MgAl2O4 spinel with mesoporous nanostructures and high surface area has been prepared by co-precipitation and post hydrothermal treatment, using glucose as organic template. Physical and chemical properties were characterized by XRD, N2 sorption, TG, FTIR, SEM, and TEM.
Mark J Rood, Zi-Feng Yan
exaly   +2 more sources

Defect processes in MgAl2O4 spinel

Solid State Sciences, 2008
Abstract In perfect normal MgAl 2 O 4 spinel the Mg 2+ ions occupy tetrahedral 8a sites and Al 3+ ions occupy octahedral 16d sites. In reality some cations are exchanged between the cation sublattices forming pairs of antisite defects and thus a degree of “inversion”.
Ball, J. A., Murphy, S. T., Grimes, R. W., Bacorisen, D., Smith, R., Uberuaga, B. P., Sickafus, K. E.   +6 more
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Shock effects in MgAl2O4-spinel

Physics and Chemistry of Minerals, 1983
Shock recovery experiments on synthetic MgAl2O4-spinel samples in the pressure range 25.5 to 50.5 GPa have been performed in order to examine the effects of shock waves on this material. The shocked samples were subsequently studied in the transmission electron microscope.
Helmut Sch�fer, Wolfgang Friedrich M�ller, Ulrich Hornemann   +2 more
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Lattice vibrations of MgAl2O4 spinel

Journal of Physics and Chemistry of Solids, 1973
Abstract Raman spectra have been measured on oriented single crystals of MgAl2O4 spinel. The fundamental frequencies are A1g = 772, Eg = 410, and T2g = 671, 492 and 311 cm−1. A Kramers-Kronig analysis of the reflectance spectrum of spinel yields the i. r. -active vibrations T1u = 670, 485, 428 and 305 cm−1.
M.P. O'Horo, A.L. Frisillo, W.B. White
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Thin film MgAl2O4: Mn spinel phosphor

Thin Solid Films, 1992
Abstract Thin films of MgAl 2 O 4 : Mn were prepared by electron gun evaporation. Films of 4 μm thickness on quartz substrate were characterized by X-ray diffraction and optical microscopy. The effect of annealing was studied, and cathodoluminescence yielded the expected green emission at 520 nm.
N. Dalacu, A.H. Kitai, B.W. Sanders, R. Huang   +3 more
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Crack-healing in spinel (MgAl2O4) ceramic

Materials Science and Engineering: A, 2015
Abstract This paper reports the crack-healing behavior in spinel ceramic. Spinel nanopowder was synthesized via mechanical activation with subsequent annealing of magnesium carbonate and aluminum hydroxide. The produced nanopowder was uniaxially pressed and then sintered at 1200 °C for 1 h.
Fariborz Tavangarian, Guoqiang Li
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Magnesium Aluminum Spinel (MgAl2O4)

1997
Publisher Summary Magnesium aluminum spinel (MgAl2O4) is a face-centered cubic material, the prototype for the spinel structural family, which includes binary oxides, sulfides, and selenides. The space group is Fd3m, unit cell length is 0.8084 nm, and the unit cell has eight formula units.
WILLIAM J. TROPF, MICHAEL E. THOMAS
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