Processing and characterization of combustion synthesized YAG powders

Ramanathan, S.; Kakade, M. B.; Roy, Sujit; Kutty, K.K.

doi:10.1016/s0272-8842(02)00190-6

Cited by 63 publications

(34 citation statements)

References 11 publications

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“…Such materials are also very efficient in infrared (IR)-to-visible up-conversion with possible applications as IR-sensitive phosphors, biological labels and up-converting materials. The appearance of many different synthesis techniques like pulsed laser deposition [12], solution combustion (propellant) [13][14][15][16][17], sol-gel [18], sol-gel combustion [19], wet chemical [20] or co-precipitation [21,22] synthesis enables the production of different nanophosphors with improved characteristics. One of the advantages of these techniques is that nanocrystalline powders are obtained as a final product.…”

Section: Introductionmentioning

confidence: 99%

Structural and luminescence investigation on gadolinium gallium garnet nanocrystalline powders prepared by solution combustion synthesis

et al. 2007

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Nanocrystalline powders of undoped and lanthanide (Pr 3+ , Tm 3+ )-doped gadolinium gallium garnet, Gd 3 Ga 5 O 12 (GGG), were prepared by propellant synthesis and studied by x-ray powder diffraction (XRD), electron diffraction (ED), high-resolution electron microscopy (HREM) and luminescence spectroscopy. The x-ray diffraction patterns of the GGG samples were analysed using the Rietveld method. The Rietveld refinement reveals the existence of two garnet-type phases: both are cubic (space group I a3d) with a slightly different lattice parameter and probably a slightly different composition. Electron diffraction and electron microscopy measurements confirm the x-ray diffraction results. EDX measurements for lanthanide-doped samples show that stable solid solutions with composition Gd 3−x Ln x Ga 5 O 12 , x ≈ 0.3 (Ln = Pr; Tm) have been obtained. The luminescence properties of the Tm 3+ -doped nanocrystalline GGG samples were measured and analysed.

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Section: Introductionmentioning

confidence: 99%

Structural and luminescence investigation on gadolinium gallium garnet nanocrystalline powders prepared by solution combustion synthesis

et al. 2007

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“…The presence of agglomerated particles is detrimental to the final state of sintering and introduces heterogeneities in the microstructure of the sintered ceramics that cannot be eliminated readily. These agglomerated particles act as defect centers [22] and therefore the agglomerates need to be eliminated by grinding. The wet grinding process is effective in reducing agglomeration [2], whereas for the nanoparticles obtained from the ethanol solvent possess an average size of 27 ± 4.49 nm.…”

Section: Resultsmentioning

confidence: 99%

Effect of different solvents in the synthesis of LaCoO3 nanopowders prepared by the co-precipitation method

Chandradass

Kim

Momade

2014

Advanced Powder Technology

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“…Anticipating that nanostructuring will enable a prosperous future development of optical devices, characterised by high brightness, reliability, low power consumption, and a long life of phosphor materials, various efficient wet-chemical synthesis routes have been developed, including sol-gel, [14] combustion processing, [15,16] co-precipitation methods, [17] hydrothermal synthesis, [18,19] and so on.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Cerium‐Activated Yttrium Aluminate Based Fine Phosphors by an Aerosol Route

et al. 2012

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Polycrystalline fine powders of yttrium aluminate doped with Ce3+ were synthesised by spray pyrolysis of a polymeric precursor, which was obtained by dissolving the corresponding nitrates in a solution of ethylenediaminetetraacetic acid (EDTA) in ethylene glycol (EG). Aerosol decomposition was performed at 550 °C followed by an additional thermal treatment (900–1100 °C). The yield of either a single yttrium aluminium perovskite (YAP) phase or a single yttrium aluminium garnet (YAG) phase was investigated as a function of the predefined yttrium/aluminium ratio, the cerium doping concentration, the processing temperature, and the thermal‐treatment regime, which included the variation of the heating and cooling rates (dT/dt), the residence time (τ), and the atmosphere. Changes in the composition and structure of the precursor during thermal decomposition were investigated by thermogravimetric and differential thermal analysis (TGA/DTA) and FTIR spectroscopy. The particle morphology and structure were analysed by a combination of scanning electron microscopy and energy‐dispersive X‐ray spectroscopy (SEM/EDS) and by high‐resolution transmission electron microscopy (HR‐TEM). The structural refinement was based on the phase identification performed by X‐ray powder diffraction (XRPD). The emission spectra were recorded within the range 325–800 nm by applying excitation wavelengths of 297 (YAP) and 450 nm (YAG). The employed synthesis conditions assured the formation of spherical, non‐agglomerated particles with well‐developed surfaces and diameters between 200 and 800 nm. For a predefined Y/Al ratio of 1:1, lower processing temperatures combined with longer heat treatments under stationary conditions resulted in a multiphase system, composed of YAP, YAG, and monoclinic yttrium aluminate (YAM) phases. However, a short heat treatment with a high heating rate (200 °C/min) at higher temperatures results in the formation of a kinetically favoured pure YAP hexagonal phase. On the other hand, for a predefined Y/Al ratio of 3:5, the generation of a thermodynamically favoured pure YAG phase has been confirmed, regardless of the applied heat‐treatment conditions. Although incomplete, Ce3+ introduction into the host matrix has been detected by XRPD and luminescence measurements.

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Processing and characterization of combustion synthesized YAG powders

Cited by 63 publications

References 11 publications

Structural and luminescence investigation on gadolinium gallium garnet nanocrystalline powders prepared by solution combustion synthesis

Structural and luminescence investigation on gadolinium gallium garnet nanocrystalline powders prepared by solution combustion synthesis

Effect of different solvents in the synthesis of LaCoO3 nanopowders prepared by the co-precipitation method

Synthesis of Cerium‐Activated Yttrium Aluminate Based Fine Phosphors by an Aerosol Route

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