Results 11 to 20 of about 1,867 (215)

Síntese do espinélio MgAl2O4 via "sol-gel" Synthesis of MgAl2O4 spinel via "sol-gel"

Cerâmica, 2005
O espinélio aluminato de magnésio MgAl2O4 é um material que apresenta uma combinação de propriedades de grande interesse tecnológico, tais como alto ponto de fusão (2135 ºC), alta resistência ao ataque químico e ao choque térmico, baixa constante ...
A. L. Heck, S. R. Taffarel, R. Hoffmann, U. L. Portugal Jr., S. L. Jahn, E. L. Foletto   +5 more
doaj   +2 more sources

Study of the High-temperature Synthesis of MgAl2O4 Spinel Refractory Raw Materials from Chromium Slag

High Temperature Materials and Processes, 2018
To make use of chromium slag waste, this study examined the technology of the preparation of MgAl2O4 spinel refractory raw material by using chromium slag.
Meng Jinxia, Chen Weiqing, Zhao Jizeng, Liu Li   +3 more
doaj   +2 more sources

Structural characteristics of MgAl2O4 spinel [PDF]

, 2023
Magnesium aluminate spinel (MgAl2O4) is a material with good mechanical, chemical, and thermal properties, low dielectric permeability and loss tangent. Based on those properties, MgAl2O4 has found a significant application in refractory ceramics, ceramics windows, integrated electronic devices, etc.
Peleš Tadić, Adriana, Živojinović, Jelena, Tadić, Nenad, Lević, Steva, Marković, Smilja, Pavlović, Vladimir B., Filipović, Suzana, Obradović, Nina   +7 more
openaire   +1 more source

Micro-arc oxidation (MAO) synthesized MgAl2O4 spinel-integrated coatings on Mg alloys: multidimensional exploration of biodegradation, biocompatibility, and osseointegration

Journal of Materials Research and Technology
The application of micro-arc oxidation (MAO) synthesized magnesium aluminate (MgAl2O4) spinel-integrated coatings on Mg alloys has great potential for orthopedic implantats, because such a coating improves biodegradation resistance, which is an important
Jun Feng, Shaohua Yuan, Zhiyong Shi, Xin Li, Yingchao Zhao, Andrej Atrens, Ming-Chun Zhao   +6 more
doaj   +2 more sources

Sonochemical preparation of high surface area MgAl2O4 spinel

Ultrasonics Sonochemistry, 2009
High surface area MgAl(2)O(4) has been synthesised by a sonochemical method. Two kinds of precursors were used, alkoxides and nitrates/acetates and in both cases nanostructured MgAl(2)O(4) was obtained. The effect of the addition of a surfactant during the sonication, cetyl trimethyl ammonium bromide, was also investigated.
TROIA, ADRIANO, PAVESE, MATTEO, GEOBALDO, FRANCESCO   +2 more
openaire   +3 more sources

Synthesis of Hercynite under Air Atmosphere using MgAl2O4 Spinel

Medžiagotyra, 2015
In this paper, the effect of MgO and MgAl2O4 spinel addition on the formation of hercynite phase was studied. For this reason, the stoichiometric mixtures of hematite and calcined alumina with various amounts of MgO were used.
Sasan Otroj
doaj   +3 more sources

First-principles calculation of the phonon spectrum of MgAl2O4 spinel [PDF]

Physical Review B, 2002
The phonon spectrum of a MgAl2O4 spinel has been calculated from first principles using density-functional theory. The spinel was perfectly ordered with space group Fd3m. The five Raman active and four infrared active modes allowed by symmetry are umambiguously identified. Agreement with available Raman, infrared, and inelastic neuron scattering dat is
de Wijs, G.A., Fang, C.M, Kresse, G., de With, G.   +3 more
openaire   +2 more sources

Thermodynamics of Mg-Al Order-Disorder Reaction in MgAl₂O₄-Spinel: Constrained by Prolonged Annealing Experiments at 773-1123 K. [PDF]

Molecules, 2021
MgAl2O4-spinel has wide industrial and geological applications due to its special structural and physical–chemical features. It is presumably the most important endmember of complex natural spinel solid solutions, and therefore provides a structural ...
Ma Y, Bao X, Liu X.
europepmc   +2 more sources

AB₂X₄ spinel structures: similarity and differences between the centrosymmetric, Fd3m, and non-centrosymmetric, F4₁32, space groups. [PDF]

Acta Crystallogr B Struct Sci Cryst Eng Mater
Both centrosymmetric, Fd3m, and non‐centrosymmetric, F4132, space groups cannot be distinguished in solving, refining and describing AB2X4 spinel structures in the harmonic approximation. They can be distinguished only by using the third‐order tensor approximation of anisotropic displacement parameters.Many compounds adopting the spinel AB2X4 structure
Arakcheeva A, Magrez A, Chapuis G.
europepmc   +2 more sources

CO2 utilization as a soft oxidant for the synthesis of styrene from ethylbenzene over Co3O4 supported on magnesium aluminate spinel: role of spinel activation temperature

Scientific Reports, 2020
Magnesium aluminate spinel (MgAl2O4) supported Co3O4 catalysts are synthesized and tested for the oxidative dehydrogenation (ODH) of ethylbenzene using CO2 as a soft oxidant.
Venkata Rao Madduluri, Ravi Kumar Marella, Marlia M. Hanafiah, Sivarama Krishna Lakkaboyana, G. Suresh babu   +4 more
doaj   +1 more source