SpinelWikipedia
Spinel (/ spɪˈnɛl /) is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl 2O 4 in the cubic crystal system.
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magnesium aluminate spinel Topics by Science.gov
Single crystals of magnesium aluminate spinel (MgAl2O4) with (100) or (110) orientations and cerium dioxide or ceria (CeO2) were irradiated by 1.0-MeV and 2.5-MeV electrons in a high fluence range. Point-defect production was studied by off-line UV-visible optical spectroscopy after irradiation.
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Synthesis of magnesium aluminate spinel nanopowder by sol
A mechanism of reaction is proposed to explain the formation of spinel at low temperature. At 800 and 900 °C a spinel mono-phase totally crystalline was observed. At 1000 °C the spinel MgAl 2 O 4 phase is well defined but a second phase magnesium oxide was found to be about 6 of the final composition. The crystal sizes were 2.272 ± 0.054
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Reduced grain boundary energies in rare-earth OSTI.GOV
Abstract. In this paper grain growth inhibition in MgAl 2 O 4 spinel nanostructure was achieved by grain boundary (GB) segregation of rare-earth dopants. Microcalorimetric measurements showed that dense spinel compacts doped with 3 mol of R 2 O 3 (R = Y Gd and La) had decreased GB energies as compared to the undoped spinel representing reduction in the driving force for grain growth.
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(PDF) Influence of mechanical activation of AL2O3 on
Stoichiometric magnesium aluminate spinel (MgAl2O4 MA)–samarium aluminate (SmAlO3 SA) ceramics have been prepared at 1580 °C for 4 h from calcined
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(PDF) Post-Annealing Effect on Transparent Mg-Zn Aluminate
In this study the transmission of (Mg1-XZnX)Al2O4 spinel which is a solid solution between Mg aluminate and Zn aluminate was investigated. After post-annealing the transmission of
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A review on processing polycrystalline magnesium aluminate
Aug 01 2020 · Available works in the processing chain for PMAS from synthesis to machining courses are reviewed in this paper as illustrated in the article overview of Fig. 2.Specifically the sintering technologies for transparent PMAS crystals which directly govern the physical properties and microstructure of the obtained workblanks are systematically classified and outlined in Section 2.
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Magnesium Aluminate (MgAl2O4) by XPS Surface Science
The XPS spectra of materials containing both magnesium and aluminum can exhibit a number of spectral artifacts when using a Mg Kα x‐ray source. These artifacts are easily observed in XPS spectra of magnesium aluminate (MgAl2O4 also known as magnesium aluminum oxide) which are presented in this article. For example the Al 2p peak is overlapped by the Mg Kα x‐ray satellites from the Mg
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In-situ formation and densification of MgAl2O4 CORE
Abstract. Stoichiometric magnesium aluminate spinel (MgAl2O4 MA)-samarium aluminate (SmAlO3 SA) ceramics have been prepared at 1580°C for 4h from calcined magnesia (MgO) commercial alumina (Al2O3) and samarium oxide (Sm2O3) by a single-stage in-situ reaction sintering (SIRS) method.
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Color-Center Production and Formation in OSTI.GOV
Single crystals of magnesium aluminate spinel (MgAl2O4) with (100) or (110) orientations and cerium dioxide or ceria (CeO2) were irradiated by 1.0-MeV and 2.5-MeV electrons in a high fluence range. Point-defect production was studied by off-line UV-visible optical spectroscopy after irradiation.
Get PriceStabilization of MgAl2O4 spinel surfaces via osti.gov
We report atomistic calculations of the low-index stoichiometric magnesium aluminate spinel (MgAl 2 O 4) surfaces each with two different chemical terminations. High temperature annealing was used to explore the potential energy landscape and provide more stable surface structures.
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Magnesium Aluminate (MgAl2O4) by XPS Surface Science
The XPS spectra of materials containing both magnesium and aluminum can exhibit a number of spectral artifacts when using a Mg Kα x‐ray source. These artifacts are easily observed in XPS spectra of magnesium aluminate (MgAl2O4 also known as magnesium aluminum oxide) which are presented in this article. For example the Al 2p peak is overlapped by the Mg Kα x‐ray satellites from the Mg
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Ion-beam-induced spinel-to-rocksalt structural phase
Apr 25 2000 · An ion-beam-induced metastable phase in magnesium aluminate spinel (MgAl 2 O 4) has been examined in detail using transmission electron microscopy. Single crystals of MgAl 2 O 4 with (111) orientation were irradiated with 180-keV Ne ions at 120 K to fluences of 10 16 and 10 17 / cm 2 .
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Sol–gel preparation of hierarchically porous magnesium
Sol–gel preparation of hierarchically porous magnesium aluminate (MgAl2O4) spinel monoliths for dye Show all. Author / Creator. Guo Xingzhong Yin Pengan Kanamori Kazuyoshi Nakanishi Kazuki Yang Hui. Publisher. New York Springer US. Formats. Articles. Journal title. Journal of sol-gel science and technology Vol.88 (1) p.114
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A review on processing polycrystalline magnesium aluminate
A review on processing polycrystalline magnesium aluminate spinel (MgAl2O4) Sintering techniques material properties and machinability.pdf Available
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(PDF) Post-Annealing Effect on Transparent Mg-Zn Aluminate
In this study the transmission of (Mg1-XZnX)Al2O4 spinel which is a solid solution between Mg aluminate and Zn aluminate was investigated. After post-annealing the transmission of
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aluminum nitrate nonahydrate Semantic Scholar
Studies on Thermal Decomposition of Aluminium Sulfate to Produce Alumina Nano Structure. F. Bustanafruz M. Jafartafreshi M. Fazli. 2012. Corpus ID . Aluminum sulfate nano structures have been prepared by solution combustion synthesis using aluminum nitrate nonahydrate (Al
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Efficient EMI/RFI attenuation by GaN-based SBIR.gov
Magnesium aluminate spinel (MgAl2O4) due to the combination of mechanical and optical properties is the material of choice for these windows. At present EMI/RFI shielding of windows is accomplished using metal grids or conductive transparent coatings which degrade their optical transmission properties.
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OSA Development of Transparent Ceramic Spinel (MgAl2O4
This paper will describe the Army s efforts to develop polycrystalline transparent ceramic from magnesium aluminate spinel (MgAl2O4) for transparent armor applications with particular emphasis on the development of cost effective ceramic powder synthesis and processing.
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(PDF) Influence of mechanical activation of AL2O3 on
Stoichiometric magnesium aluminate spinel (MgAl2O4 MA)–samarium aluminate (SmAlO3 SA) ceramics have been prepared at 1580 °C for 4 h from calcined
Get PriceMagnesium Aluminate (MgAl2O4) by XPS Surface Science
The XPS spectra of materials containing both magnesium and aluminum can exhibit a number of spectral artifacts when using a Mg Kα x‐ray source. These artifacts are easily observed in XPS spectra of magnesium aluminate (MgAl2O4 also known as magnesium aluminum oxide) which are presented in this article. For example the Al 2p peak is overlapped by the Mg Kα x‐ray satellites from the Mg
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Mu Yun Lei Scientific.Net
Abstract The present paper summarizes the technology and basic process for fabricating transparent ceramic MgAl2O4 spinel and introduces a scalable production technique. Fully transparent polycrystalline spinel has been prepared by combined vacuum sintering hot-pressing sintering in H2 atmosphere and hot isostatic pressing(HIP).
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Synthesis of magnesium aluminate spinel nanopowder by sol
Abstract Nanospinel MgAl2O4 powder was obtained by a sol–gel method at low-temperature processing. It was synthesized using aluminum tri-sec-butoxide and magnesium nitrate hexahydrate as precursors in an acid medium at 80 °C.
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(PDF) Magnesium Aluminate (MgAl2O4) by XPS
The XPS spectra of materials containing both magnesium and aluminum can exhibit a number of spectral artifacts when using a Mg Kα x ray source. These artifacts are easily observed in XPS spectra of
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(PDF) Magnesium Aluminate (MgAl2O4) by XPS
The XPS spectra of materials containing both magnesium and aluminum can exhibit a number of spectral artifacts when using a Mg Kα x ray source. These artifacts are easily observed in XPS spectra of
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Nanocrystalline MgAl2O4 as an efficient catalyst for one
Abstract An efficient and eco-friendly procedure has been developed using nanocrystalline MgAl2O4 with specific surface area as catalyst for rapid and an improved synthesis of 2 4 5-trisubstituted and 1 2 4 5-tetrasubstituted imidazoles under solvent-free conditions in excellent yields. The method has several benefits such as shorter reaction time recyclable catalyst and excellent yields.
Get PriceWhy host to dopant energy transfer is absent in the
An undoped and Eu 3 doped magnesium aluminate spinel (MAS) was synthesized using a citric acid assisted combustion technique. MAS samples were characterized systematically using X-ray diffraction (XRD) time resolved photoluminescence spectroscopy (TRPLS) and ab initio calculations. On irradiating the undoped MAS with UV light multicolor emission is observed.
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magnesium aluminate mgal2o4 Topics by Science.gov
Transparent magnesium aluminate spinel (MgAl2O4) ceramic is one of an important optical materials. However due to its pronounced hardness and brittleness the optical machining of this material is very difficult. Diamond turning has advantages over the grinding process in
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magnesium spinel mgal2o4 Topics by Science.gov
A low cost highly stable spinel magnesium aluminate (MgAl2O4) material synthesized at nanoscale is used for composite formation with antimony sulphide (Sb2S3) material having high absorption coefficient in the visible light of solar spectrum. A review of recent patents shows that the field of photoctalysis is dominated by the traditional TiO2
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