Synthesis of aluminum borate whiskers via flux method with and without microwaves

Kim, Sung‐Wan; Lee, S. G.; Kim, J. K.; Kwon, Ji-Yun; Park, H. C.; Park, S. S.

doi:10.1023/b:jmsc.0000013914.91971.8b

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…Many mechanisms have been proposed for the growth process of whiskers in recent years, such as vaporliquid-solid (VLS) [31], vapor-solid (VS) [32,33], selfcatalytic [15,34,35], liquid-solid (LS) [36] and solidliquid-solid (SLS) mechanisms [37]. In this study, no metal catalysts or templates were used in the raw materials, and no tips were found at the ends of the During the preparation process of Mg 2 B 2 O 5 whiskers using the wet molten salt method, the aqueous mixture water solution of MgCl 2 , H 3 BO 3 and NaCl first reacted with NaOH solution, with the main reaction between MgCl 2 and NaOH generating Mg(OH) 2 precipitates (Eq.…”

Section: Growth Mechanism Of Borate Whiskersmentioning

confidence: 99%

Molten-salt assisted synthesis and characterization of Mg₂B₂O₅ and Al₁₈B₄O₃₃ whiskers

Liu

Wang

et al. 2021

Journal of Asian Ceramic Societies

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In this work, magnesium borate (Mg 2 B 2 O 5 ) and aluminum borate (Al 18 B 4 O 33 ) whiskers with a high aspect ratio were successfully synthesized using a molten salt method. The phase transformation and morphology involution of the whiskers were studied by XRD, IR-FT, TG-DSC, and SEM-EDS with different boron/metal ratios and reaction temperatures. The results show a rich boron environment and appropriate reaction temperature to be the crucial factors with respect to the composition and morphology of the borate whiskers. Mg 2 B 2 O 5 whiskers with a diameter of several hundred nanometers and a 10-60 length-diameter ratio were obtained when the B/Mg ratio was 1.5:1 and the reaction temperature was 800°C. For Al 18 B 4 O 33 whiskers, a synthesis temperature of 1000°C and a B/Al ratio of 3:9 were found to be optimal with respect to the whisker morphology. A liquid-solid (LS) mechanism is proposed as the growth mechanism of the whiskers on the basis of the experimental phenomena.

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Section: Growth Mechanism Of Borate Whiskersmentioning

confidence: 99%

Molten-salt assisted synthesis and characterization of Mg₂B₂O₅ and Al₁₈B₄O₃₃ whiskers

Liu

Wang

et al. 2021

Journal of Asian Ceramic Societies

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“…Aluminum borate (Al 5 BO 9 ), a special class of material with a mullite‐type structure (more specifically called “boromullite”) gained significant importance in ceramic industry due to its low density, high mechanical strength, low thermal expansion coefficient, damage tolerance, and so on 1–7 . Al 5 BO 9 was investigated widely for its crystal structure, physical, thermal properties, and its applications in various fields, namely, nonlinear optics, solid‐state lighting, and so on 8–18 .…”

Section: Introductionmentioning

confidence: 99%

“…Aluminum borate (Al 5 BO 9 ), a special class of material with a mullite-type structure (more specifically called "boromullite") gained significant importance in ceramic industry due to its low density, high mechanical strength, low thermal expansion coefficient, damage tolerance, and so on. [1][2][3][4][5][6][7] Al 5 BO 9 was investigated widely for its crystal structure, physical, thermal properties, and its applications in various fields, namely, nonlinear optics, solid-state lighting, and so on. [8][9][10][11][12][13][14][15][16][17][18] However, till date there were no reports in the field of radiation dosimetry where thermoluminescence (TL) is one of the most widely used techniques that covers personnel, clinical, and food irradiation dosimetry.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and thermoluminescence‐based high‐dose neutron and gamma dosimetry study of Al₅BO₉: Mn, Li nanophosphor

et al. 2022

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A near tissue equivalent (Zeff = 10.8) and wide bandgap (Eg = 5.95 eV) Al5BO9: Mn, Li nanophosphor was synthesized by facile gel‐combustion (GC) method, and structural characterizations were performed by XRD, infra‐red, transmission electron microscopy, energy‐dispersive spectra, diffuse reflectance UV–visible spectra, and PL studies. Thermoluminescence (TL) study of Al5BO9: Mn, Li revealed the dosimetry glow peak at 542 K, which was absent in undoped Al5BO9 indicating the importance of Mn dopant. The highest TL response was obtained for the lowest studied dopant concentration (0.1 mol% Mn) that was attributed to the concentration quenching phenomenon. The material is highly reusable with low fading (<10%) up to 110 days. TL response for both thermal neutron and gamma radiations showed excellent linearity within 5 × 109–3 × 1011 n/cm2 and 30–5000 Gy, respectively. These studies suggested promising potential of Al5BO9: Mn, Li nanophosphor in clinical neutron dosimetry and food irradiation dosimetry applications. Based on the variation of calcination temperature, strategy toward dual application, namely, radiation dosimeter and red‐light emitting phosphor of the material was established. For a better understanding of the TL process, various kinetic parameters like activation energy (E), order of kinetics (b), and frequency factor (s) were evaluated using different methodologies, and the results were found to be in good agreement.

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The effects of solvent and microwave on the preparation of Magnesium Oxide Precursor

Chen

et al. 2014

Crystal Research and Technology

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Four methods including hydrothermal method, glycolhydrothermal method, microwave-hydrothermal method and glycol-microwave-hydrothermal method were used to prepare magnesium oxide precursor by the reaction of MgSO 4 ·7H 2 O with (NH 4 ) 2 CO 3 . The composition, crystallinity, morphology, aspect ratio, yield, functional groups, atom distribution, and interplanar spacing of the sample were investigated by X-ray diffraction (XRD), Scan Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and High Resolution Transmission Electron Microscope (HRTEM). The properties of Magnesium Oxide precursor were compared with each other. The results of FT-IR and XRD showed that the crystals were all nesquehonite. However, it was shown by FT-IR results that the crystals prepared by glycol-microwave-hydrothermal method contained OH − and HCO 3 − groups, which indicated that the Mg(OH)(HCO 3 )·2H 2 O type crystals would be facilitated by this method. The glycol-hydrothermal method can create high quality Magnesium Oxide precursor with a high degree of crystallinity, high purity, high aspect ratio, smooth surface, and good dispersibility.

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Synthesis of aluminum borate whiskers via flux method with and without microwaves

Cited by 9 publications

References 14 publications

Molten-salt assisted synthesis and characterization of Mg₂B₂O₅ and Al₁₈B₄O₃₃ whiskers

Molten-salt assisted synthesis and characterization of Mg₂B₂O₅ and Al₁₈B₄O₃₃ whiskers

Synthesis, characterization, and thermoluminescence‐based high‐dose neutron and gamma dosimetry study of Al₅BO₉: Mn, Li nanophosphor

The effects of solvent and microwave on the preparation of Magnesium Oxide Precursor

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Synthesis of aluminum borate whiskers via flux method with and without microwaves

Cited by 9 publications

References 14 publications

Molten-salt assisted synthesis and characterization of Mg2B2O5 and Al18B4O33 whiskers

Molten-salt assisted synthesis and characterization of Mg2B2O5 and Al18B4O33 whiskers

Synthesis, characterization, and thermoluminescence‐based high‐dose neutron and gamma dosimetry study of Al5BO9: Mn, Li nanophosphor

The effects of solvent and microwave on the preparation of Magnesium Oxide Precursor

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Molten-salt assisted synthesis and characterization of Mg₂B₂O₅ and Al₁₈B₄O₃₃ whiskers

Molten-salt assisted synthesis and characterization of Mg₂B₂O₅ and Al₁₈B₄O₃₃ whiskers

Synthesis, characterization, and thermoluminescence‐based high‐dose neutron and gamma dosimetry study of Al₅BO₉: Mn, Li nanophosphor