Optimization of spray freeze drying parameters for spark plasma sintering of transparent MgAl2O4 spinel

Basiri, Aref; Nassajpour-Esfahani, Amir Hossein; Haftbaradaran-Esfahani, Mohammad Reza; Alhaji, A.; Shafyei, A.

doi:10.1016/j.ceramint.2021.12.291

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Currently, magnesium aluminum spinel is the most widely researched and used. In comparison, zinc aluminum spinel has better acid and alkali resistance and higher thermal conductivity [25][26][27][28][29], and its [AlO 6 ] octahedral coordination environment matches well with Cr 3+ ions. It holds promise for the preparation of fluorescent ceramics for high-power/high-brightness WLEDs.…”

Section: Introductionmentioning

confidence: 99%

Spinel-Based ZnAl2O4: 0.5%Cr3+ Red Phosphor Ceramics for WLED

Ji,

Xu,

Qiang

et al. 2024

Materials

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To address the issue of the lack of red light in traditional Ce3+: YAG-encapsulated blue LED white light systems, we utilized spark plasma sintering (SPS) to prepare spinel-based Cr3+-doped red phosphor ceramics. Through phase and spectral analysis, the SPS-sintered ZnAl2O4: 0.5%Cr3+ phosphor ceramic exhibits good density, and Cr3+ is incorporated into [AlO6] octahedra as a red emitting center. We analyzed the reasons behind the narrow-band emission and millisecond-level lifetime of ZAO: 0.5%Cr3+, attributing it to the four-quadrupole interaction mechanism as determined through concentration quenching modeling. Additionally, we evaluated the thermal conductivity and thermal quenching performance of the ceramic. The weak electron-phonon coupling (EPC) effects and emission from antisite defects at 699 nm provide positive assistance in thermal quenching. At a high temperature of 150 °C, the thermal conductivity reaches up to 14 W·m−1·K−1, and the 687 nm PL intensity is maintained at around 70% of room temperature. Furthermore, the internal quantum efficiency (IQE) of ZAO: 0.5%Cr3+ phosphor ceramic can reach 78%. When encapsulated with Ce3+: YAG for a 450 nm blue LED, it compensates for the lack of red light, adjusts the color temperature, and improves the color rendering index (R9). This provides valuable insights for the study of white light emitting diodes (WLEDs).

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Section: Introductionmentioning

confidence: 99%

Spinel-Based ZnAl2O4: 0.5%Cr3+ Red Phosphor Ceramics for WLED

Ji,

Xu,

Qiang

et al. 2024

Materials

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“…Additionally, magnesium aluminate boasts advantageous properties, such as a high melting point (2135 °C), low density (3.58 g/cm 3 ), remarkable high-temperature strength, and outstanding resistance to chemical corrosion. Various methods have been employed for the production of magnesium aluminate, such as solid-state, spray drying, sol–gel, coprecipitation, and freeze-drying techniques. − However, most of these approaches are intricate and costly, posing challenges for large-scale production of nanosized materials when compared to Pechini sol–gel synthesis. Furthermore, these methods come with disadvantages, including the requirement of high temperatures, uneven product distribution, and limited surface area in the resulting nanosized materials.…”

Section: Introductionmentioning

confidence: 99%

Efficient Photocatalytic Degradation of Congo Red Dye Using Facilely Synthesized and Characterized MgAl₂O₄ Nanoparticles

Al-Farraj,

Abdelrahman

2024

ACS Omega

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The discharge of congo red dye into water sources by factories has been associated with a range of health concerns, such as cancer, redness, skin irritation, and allergic reactions. As a result, this research focused on the cost-effective and straightforward production of MgAl 2 O 4 nanoparticles by using the Pechini sol−gel process. Subsequently, these nanoparticles were employed for the successful photocatalytic decomposition of congo red dye. Moreover, extensive characterization of the fabricated MgAl 2 O 4 nanoparticles was conducted through diverse methodologies, which included Fouriertransform infrared spectroscopy, ultraviolet−visible spectrophotometry, highresolution transmission electron microscopy (HR-TEM), field-emission scanning electron microscopy (FE-SEM), and powder X-ray diffraction (XRD). Furthermore, the XRD analysis disclosed that the average crystal size of the produced MgAl 2 O 4 nanoparticles is 10.36 nm, and their optical energy gap was determined to be 3.71 eV. The FE-SEM examination unveiled a combination of spherical and disorganized structures with a 0.14 μm average grain size. HR-TEM analysis, in turn, revealed that the fabricated MgAl 2 O 4 nanoparticles were composed of minuscule spherical particles with an average diameter of 8.75 nm. The maximum degradation of 50 mL of congo red dye at a concentration of 25 mg/L reached 99.27% within 80 min at a pH of 3. Additionally, the findings confirmed the consistent decomposition activity toward congo red dye even after four cycles, thereby validating the effectiveness and reusability of the MgAl 2 O 4 nanoparticles that were developed in this study.

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Efficient Photocatalytic Decomposition of Acid Blue 25 Dye using Facilely Synthesized Magnesium Aluminate Nanoparticles

Al-Farraj,

Khairy,

Saad

et al. 2024

Water Conserv Sci Eng

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Optimization of spray freeze drying parameters for spark plasma sintering of transparent MgAl2O4 spinel

Cited by 4 publications

References 19 publications

Spinel-Based ZnAl2O4: 0.5%Cr3+ Red Phosphor Ceramics for WLED

Spinel-Based ZnAl2O4: 0.5%Cr3+ Red Phosphor Ceramics for WLED

Efficient Photocatalytic Degradation of Congo Red Dye Using Facilely Synthesized and Characterized MgAl₂O₄ Nanoparticles

Efficient Photocatalytic Decomposition of Acid Blue 25 Dye using Facilely Synthesized Magnesium Aluminate Nanoparticles

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Optimization of spray freeze drying parameters for spark plasma sintering of transparent MgAl2O4 spinel

Cited by 4 publications

References 19 publications

Spinel-Based ZnAl2O4: 0.5%Cr3+ Red Phosphor Ceramics for WLED

Spinel-Based ZnAl2O4: 0.5%Cr3+ Red Phosphor Ceramics for WLED

Efficient Photocatalytic Degradation of Congo Red Dye Using Facilely Synthesized and Characterized MgAl2O4 Nanoparticles

Efficient Photocatalytic Decomposition of Acid Blue 25 Dye using Facilely Synthesized Magnesium Aluminate Nanoparticles

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Efficient Photocatalytic Degradation of Congo Red Dye Using Facilely Synthesized and Characterized MgAl₂O₄ Nanoparticles