Fabrication of transparent MgAl2O4 spinel through homogenous green compaction by microfluidization and slip casting

Kim, Jin-Myung; Kim, Ha Neul; Park, Young-Jo; Ko, Jae‐Woong; Lee, Jae‐Wook; Kim, Hai-Doo

doi:10.1016/j.ceramint.2015.07.121

Cited by 49 publications

(18 citation statements)

References 28 publications

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“…The irradiation of samples with He + ions weakened PL and strongly modified PLE spectra of all bands, except for that of Cr 3+ impurity (not shown). In particular, UV1 band was strongly suppressed, which is in agreement with previous observations of radioluminescence and cathodoluminescence of spinel crystals after irradiation with protons and neutrons [9,[16][17][18]. This effect, not specific to the nature of ionized particles, has been tentatively ascribed to a partial inversion of normal spinel and formation of antisite defects.…”

Section: Resultssupporting

confidence: 90%

“…The mass density of the pellets was measured by helium pycnometer (micromeritics AccuPyc II 1340). The relative density was calculated assuming the bulk mass density ρ 0 =3.578 g/cm 3 of MgAl 2 O 4 spinel [9]. The transmittance test of the prepared ceramics was realised in the near-IRvisible-UV spectral range using Lambda 35 UV/Vis spectrometer (PerkinElmer, France) at the normal incidence of the collimated light beam, with the detector placed at 1 cm behind a pellet (solid angle of the reception ~1 rad).…”

Section: Methodsmentioning

confidence: 99%

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Effects of Ta doping and irradiation with He+ ions on photoluminescence of MgAl2O4 spinel ceramics

Spiridigliozzi

Pille

Schoenstein

et al. 2020

Journal of the European Ceramic Society

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Photoluminescence (PL) properties of pristine and Ta-doped MgAl 2 O 4 spinel ceramics prepared via spark plasma sintering technique and irradiated with He + ions were studied. The results indicate strong influence of the grain boundaries on PL spectra. Ta doping promotes the formation of O and Al vacancies at the grain boundaries leading to an increased number density of F + centres. The ionised irradiation forms antisites preferentially at the grain boundaries, which inhibit excitonic PL and exciton energy transfer while do not affect proper PL of lattice defects. A weak PL excitation band at 7.25±0.25 eV may belong to excitons localised near bulk antisites. In the Ta-doped ceramics, the electronic transitions between 5.75 eV and 7.0 eV belong to an intermediate state situated at the grain boundaries and structurally linked to Ta, which readily transfers energy to F and F + centres; it was assigned to the nucleated Mg 4 Ta 2 O 9 phase.

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Section: Resultssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Effects of Ta doping and irradiation with He+ ions on photoluminescence of MgAl2O4 spinel ceramics

Spiridigliozzi

Pille

Schoenstein

et al. 2020

Journal of the European Ceramic Society

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“…The powder is characterized by a BET specific surface area of 26 m 2 g −1 and a median particle size (d 50 ) of 0.2 µm according to the data provided by the supplier. The spinel powder contains minute amounts of impurities, mainly, S(600), Na(41), and Ca (15) in wt. ppm.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, spinel is usually densified by two-stage sintering, i.e., pressure-less sintering followed by hot isostatic pressing (post HIPing). Alternatively, spinel can be produced via single-stage pressure-assisted sintering, such as hot pressing (HP) or spark plasma sintering (SPS) [2,[14][15][16][17]. Using the SPS method makes it possible to fabricate highly dense spinel bodies at a significantly lower temperature and a shorter time as compared with the other methods; this enables suppressing grain growth and producing high-quality samples.…”

Section: Introductionmentioning

confidence: 99%

Densification of Magnesium Aluminate Spinel Using Manganese and Cobalt Fluoride as Sintering Aids

et al. 2019

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Highly dense magnesium aluminate spinel bodies are usually fabricated using pressure-assisted methods, such as spark plasma sintering (SPS), in the presence of lithium fluoride as a sintering aid. The present work investigates whether the addition of transition metal fluorides promotes the sintering of MgAl2O4 bodies during SPS. At the same time, such fluorides can act as a source of optically active dopants. A commercial MgAl2O4 was mixed with 0.5 wt% of LiF, MnF2, and CoF2 and, afterwards, consolidated using SPS at 1400 °C. Although MnF2 and CoF2 promote the densification as effectively as LiF, they cause significant grain growth.

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“…The full width at half maximum of the pore size distribution was obtained by fitting the pore size distribution based on the Gaussian distribution function. 35 Microstructure of the chemically etched ceramic was observed by scanning electron microscopy (SEM, Model S-3400, Hitachi, Tokyo, Japan). The average grain size and distribution of grain size of the ceramic was estimated from optical images using the linear intercept method by counting over 250 grains.…”

Section: Methodsmentioning

confidence: 99%

Highly transparent Mg_0.27Al_2.58O_3.73N_0.27 ceramic fabricated by aqueous gelcasting, pressureless sintering, and post‐HIP

Zong

Wang

et al. 2019

J Am Ceram Soc

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Magnesium aluminum oxynitride (Mg 0.27 Al 2.58 O 3.73 N 0.27 , termed as MgAlON) ceramics with high transparency and complicated shape was prepared by aqueous gelcasting, pressureless sintering, and followed by hot isostatic pressing. No obvious hydration was found by the characterizations of X-ray diffraction, pH value, Fourier transform infrared and thermal analysis for the interaction between MgAlON spinel powders and water, leading to the stable MgAlON slurry with high solid loading (52 vol%) and low viscosity. This result may be due to different composition of MgAlON from that of MgAl 2 O 4 and AlON. Besides, transparent MgAlON ceramic (1.95 mm in thickness) with a high in-line transmittance ~86.3% at 3.7 μm was fabricated. The refractive index ~1.7499 at 589.3 nm and absorption coefficient ~1.2 cm −1 at 5 μm of MgAlON are between those of AlON and MgAl 2 O 4 transparent ceramics, and Abbé number ~73.66 of MgAlON is the highest. K E Y W O R D S aqueous gelcasting, Mg 0.27 Al 2.58 O 3.73 N 0.27 , PS/HIP, transparent ceramic

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Fabrication of transparent MgAl2O4 spinel through homogenous green compaction by microfluidization and slip casting

Cited by 49 publications

References 28 publications

Effects of Ta doping and irradiation with He+ ions on photoluminescence of MgAl2O4 spinel ceramics

Effects of Ta doping and irradiation with He+ ions on photoluminescence of MgAl2O4 spinel ceramics

Densification of Magnesium Aluminate Spinel Using Manganese and Cobalt Fluoride as Sintering Aids

Highly transparent Mg_0.27Al_2.58O_3.73N_0.27 ceramic fabricated by aqueous gelcasting, pressureless sintering, and post‐HIP

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Fabrication of transparent MgAl2O4 spinel through homogenous green compaction by microfluidization and slip casting

Cited by 49 publications

References 28 publications

Effects of Ta doping and irradiation with He+ ions on photoluminescence of MgAl2O4 spinel ceramics

Effects of Ta doping and irradiation with He+ ions on photoluminescence of MgAl2O4 spinel ceramics

Densification of Magnesium Aluminate Spinel Using Manganese and Cobalt Fluoride as Sintering Aids

Highly transparent Mg0.27Al2.58O3.73N0.27 ceramic fabricated by aqueous gelcasting, pressureless sintering, and post‐HIP

Contact Info

Product

Resources

About

Highly transparent Mg_0.27Al_2.58O_3.73N_0.27 ceramic fabricated by aqueous gelcasting, pressureless sintering, and post‐HIP