Results 161 to 170 of about 3,718 (215)

Studies on Mn3O4MgAl2O4 system

Journal of Inorganic and Nuclear Chemistry, 1975
Structural, electrical and magnetic properties of solid solutions of tetragonal Mn3O4 (c/a>1) and cubic MgAl2O4 over the whole composition range have been investigated. All the samples were found to be monophasic and exhibited either tetragonal or cubic symmetry at room temperature/ Tetragonal-cubic transition appeared to be of the first order ...
KEER, HV, BODAS, MG, BHADURI, A, BISWAS, AB   +3 more
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Synthesis, microstructure and oxidation of Co-MgAl2O4 and Ni-MgAl2O4 nanocomposite powders

Nanostructured Materials, 1996
MgAl2O4-CoAl2O4 and MgAl2O4-NiAl2O4 solid solutions are synthesized by combustion in urea of the appropriate metal nitrates. The selective reduction in hydrogen of these oxides gives rise to a dispersion of nanometric Co or Ni particles in the spinel matrix. The reduction of the Co2+ and Ni2+ ions is complete at 900 and 1000 °C respectively.
Quénard, Olivier, Laurent, Christophe, Brieu, Marc, Rousset, Abel   +3 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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Raman study of MgAl2O4–FeAl2O4 and MgAl2O4–MgFe2O4 spinel solid solutions

, 2015
Spinels oxides are minerals or synthetic materials which are nowadays attracting considerable interests because of their physical and chemical properties. Ten synthetic spinels belonging to the MgAl2O4–FeAl2O4 solid-solution and four synthetic spinels belonging to the MgAl2O4–MgFe2O4 solid-solution have been studied by Raman spec-troscopy to verify the
D'IPPOLITO, VERONICA, ANDREOZZI, Giovanni Battista, Lottici, Pier Paolo, Bersani, Danilo   +3 more
openaire   +2 more sources

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Synthesis of MgAl2O4 nanopowders

Inorganic Materials, 2011
A procedure has been developed for the synthesis of MgAl2O4 nanopowders with a characteristic particle size of 10–40 nm. Translucent hydrous xerogels have been synthesized as precursors to MgAl2O4. The synthesized magnesium aluminum spinel nanopowders are promising for the fabrication of optical ceramics.
S. V. Kuznetsov, P. P. Fedorov, V. V. Voronov, V. V. Osiko   +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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A Density Functional Study of Interactions at the Metal–Ceramic Interfaces Al/MgAl2O4 and Ag/MgAl2O4

physica status solidi (a), 1998
Ab-initio density functional calculations were performed on the geometric and the electronic structures of coherent cube-on-cube interfaces between spinel (MgAl 2 O 4 ) and the two metals Al and Ag. The calculations were carried out in the local density approximation (LDA) employing norm-conserving pseudopotentials and a mixed basis set of plane waves ...
S. Köstlmeier, C. Elsässer, B. Meyer, M. W. Finnis   +3 more
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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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