Results 171 to 180 of about 10,946 (217)

Fracture of single crystal MgAl2O4

Journal of Materials Science, 1980
The fracture of single crystal, stoichiometric MgAl2O4 spinel, was investigated for the (1 0 0), (1 1 0), and (1 1 1) from room temperature to 1500° C. Two regions of fracture behaviour were observed; a low temperature elastic region where K lc decreased with increasing temperature, and an elevated temperature region where K lc increased rapidly with ...
R. L. Stewart, R. C. Bradt
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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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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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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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Raman study of MgAl2O4–CoAl2O4 and MgAl2O4–MgCr2O4 solid solutions

2015
Spinels are very important minerals in terrestrial and extraterrestrial rocks as well as materials of high relevance from a gemological and technological point of view for their remarkable physical properties. Ten synthetic spinels belonging to the MgAl2O4– CoAl2O4 and to the MgAl2O4–MgCr2O4 solid solutions have been studied by Raman spectroscopy to ...
D'IPPOLITO, VERONICA, ANDREOZZI, Giovanni Battista, Bersani, Danilo, Lottici, Pier Paolo   +3 more
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Crystallization of MgAl2O4 and its effect on strengthening-toughening behavior in TiAlN/MgAl2O4 nanomultilayers

Vacuum, 2017
Abstract TiAlN/MgAl2O4 nanomultilayers with different MgAl2O4 layer thickness (lMgAl2O4) were fabricated. Studies show that under the template effect of TiAlN layers driven by interfacial energy minimization, amorphous MgAl2O4 crystallized and grew epitaxially with TiAlN layers, forming high-quality layered structure and coherent interface at low ...
Yidan Zhang, Hao Huang, Kan Zhang, Suxuan Du, Yifan Yang, Mao Wen   +5 more
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The first-principle studies of the crystal phase transitions: Fd3m-MgAl2O4→F4-3m-MgAl2O4

Physica B: Condensed Matter, 2011
Abstract Magnesium aluminum spinel (MgAl 2 O 4 ) is a major constituent of the shallow upper mantle. It is of great geophysical importance to explore its physical properties under high pressure and temperature. The first-principle density functional theory (DFT) with the plane wave along with pseudopotential was employed to obtain the total energy ...
Liang Zhang, Guang-Fu Ji, Feng Zhao, Chuan-Min Meng, Dong-Qing Wei   +4 more
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Impurity Mn2+ defects in MgAl2O4 nanoceramics

AIP Conference Proceedings, 2020
Nanoceramics of Mg1-xMnxAl2O4; x=0.005, 0.00005 was obtained using thermobaric synthesis method. As a result of an increase in the concentration of impurity manganese, the impurity is redistributed over cationic positions, which stimulates lattice compression.
V. A. Dutov, A. N. Kiryakov, A. F. Zatsepin, A. V. Fokin, T. V. Dyachkova, A. P. Tytunnyuk, Yu. G. Zainulin   +6 more
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ChemInform Abstract: TRANSLUCENT SINTERED MGAL2O4

Chemischer Informationsdienst, 1974
AbstractEine durchscheinende polykristalline MgAlz O4‐Keramik wird aus feinverteiltem Spinell, dem als Sinterhilfe CaO′ zugesetzt wird, durch Sintern hergestellt.
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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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