Influence of Complexing Agents and pH on Yttrium−Iron Garnet Synthesized by the Sol−Gel Method

Vaqueiro, Paz; López‐Quintela, M. Arturo

doi:10.1021/cm970165f

Cited by 150 publications

(68 citation statements)

References 22 publications

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“…A broad band in the metal-oxide region indicated the onset of the formation of metal-oxide bonds. The characteristic bands of YAG were observed for the samples calcined at 800 o C and 1000 o C. The FT-IR analysis concluded the citrate structure breakdown with some residual carbonates up to 700 o C. These results were consistent with that obtained by TGA 8 .…”

Section: Resultssupporting

confidence: 87%

Sol-gel Synthesis and Characterisation of NanocrystallineYttrium Aluminum Garnet Nanopowder

Devi¹,

Choudhary²,

Satsangi³

et al. 2008

DSJ

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The synthesis of yttrium aluminum garnet (YAG) (Y 3 Al 5 O 12 ) nanopowder was carried out by sol-gel method. Y(NO 3 ) 3 .6H 2 O, Al(NO 3 ) 3 .9H 2 O in the presence of citric acid as complexing agent were used as starting materials. YAG nanopowder was characterised by FTIR, TGA, and XRD. To get phase-pure nanocrystalline YAG powder at relatively lower temperature, calcination at various temperatures was studied and calcination temperature was optimised. Particle size, estimated by XRD using Scherrer's equation, was found to be 2835 nm which was further confirmed by transmission electron microscopy. The particle morphology was studied by SEM.

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Section: Resultssupporting

confidence: 87%

Sol-gel Synthesis and Characterisation of NanocrystallineYttrium Aluminum Garnet Nanopowder

Devi¹,

Choudhary²,

Satsangi³

et al. 2008

DSJ

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“…2) treated from 150 °C to 900 °C. In the spectrum of the gel at 150 °C there was no peaks in the M-O region, the bands at ~ 1562 cm -1 and ~ 1384 cm -1 can be assigned to the ionized carboxylates and carbonates resulting from the rupture of citrate network 5 and intensities of these peaks reduced significantly at 500 °C along with a broad band in the M-O region. At 750 °C the intensities of the peaks corresponding to the organic residues had further reduced and that in the M-O region had become more prominent.…”

Section: Resultsmentioning

confidence: 93%

Studies of Process Parameters on Scale up of Nd:YAG Nanopowder Synthesis by Sol-gel Process

Laishram¹,

Rekha²,

Malhan³

et al. 2012

DSJ

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Scale up of process from 6 g to 200 g batch for preparation of phase pure Neodymium doped Yttrium Aluminum Garnet (Nd:yAG) nanopowder by sol-gel process using nitrate-citrate route was carried out. Optimisation of process parameters was done to resolve problems associated with large batch such as evolution of large amount of acidic fumes, increased gelation and drying time and incomplete calcination. The problem of exhaust of excess acidic fumes with size scale up was handled by passing ammonia and optimized pH of the sol. Process of drying the sol was optimised for large batch size. On scaling up from 6 g to 200 g batch incomplete crystallization was observed on calcination under conditions optimized for 6 g batch. The causes of incomplete calcination with size scale up was identified and resolved to achieve completely crystalline particles in the range of ~25 nm to 50 nm.

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“…Further sintering studies of Nd:GGG nanopowders with reference to retention of phase purity has not been explored. The ratio of complexing agent-to-metal cations is an important parameter because it decides the amount of organics to be removed during calcinations, which in turn affects the ceramic properties 17,18 . In the present work, synthesis of Nd:GGG nanopowders using different nitrate-to-citrate molar ratios by microwave gel combustion technique is being reported for the first time.…”

Section: Introductionmentioning

confidence: 99%

Nd:GGG Nanopowders by Microwave Gel Combustion Route and Sinterability Studies

2014

DSJ

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Synthesis of Nd 0.03 Gd 2.97 Ga 5 O 12 (Nd:GGG) nanopowder was carried out by microwave-assisted nitrate-citrate gel combustion technique. Various nitrate-to-citrate ratios from stoichiometric-to-fuel lean were explored. Gels were combusted by microwave heating and the combusted powders were calcined at 900 O C for 2 h. Fourier Transform Infra-red Spectroscopy (FTIR) and X-ray Diffraction (XRD) of calcined nanopowders showed phase pure Nd:GGG formation, from stoichiometric-to-fuel lean nitrate-to-citrate ratio of 1 to 0.416. Particles in the size range of 150 nm -200 nm were obtained for stoichiometric ratio. Highly uniform, spherical morphology, with size range 90 nm -100 nm, were obtained in fuel lean ratio of 1 to 0.416. Sintering of these nanopowders at 1550 °C for 2 h in air resulted in retention of phase purity as observed by XRD. Grain growth of less than 2 µm, for fuel lean ratio of 1 to 0.416, indicated formation of highly sinterable Nd:GGG nanopowders.

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Influence of Complexing Agents and pH on Yttrium−Iron Garnet Synthesized by the Sol−Gel Method

Cited by 150 publications

References 22 publications

Sol-gel Synthesis and Characterisation of NanocrystallineYttrium Aluminum Garnet Nanopowder

Sol-gel Synthesis and Characterisation of NanocrystallineYttrium Aluminum Garnet Nanopowder

Studies of Process Parameters on Scale up of Nd:YAG Nanopowder Synthesis by Sol-gel Process

Nd:GGG Nanopowders by Microwave Gel Combustion Route and Sinterability Studies

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