Synthesis of nanocrystalline yttria by sol–gel method

Subramanian, Ramanathan; Shankar, P.; Kavithaa, S.; Ramakrishnan, Sayanthan; Angelo, P. C.; Venkataraman, Harihara

doi:10.1016/s0167-577x(00)00324-4

Cited by 45 publications

(21 citation statements)

References 7 publications

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“…The average crystallite size is found to be in the range [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] during combustion [19]. The lattice strain and crystallite size are estimated using Williamson-Hall (W-H) equation [20],…”

Section: Resultsmentioning

confidence: 99%

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Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Shivaramu

Lakshminarasappa

Nagabhushana

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Nanocrystalline Y 2 O 3 is synthesized by solution combustion technique using urea and glycine as fuels. X-ray diffraction (XRD) pattern of as prepared sample shows amorphous nature while annealed samples show cubic nature. The average crystallite size is calculated using Scherrer's formula and is found to be in the range 14-30 nm for samples synthesized using urea and 15-20 nm for samples synthesized using glycine respectively. Field emission scanning electron microscopy (FE-SEM) image of 1173 K annealed Y 2 O 3 samples show well separated spherical shape particles and the average particle size is found to be in the range 28-35 nm. Fourier transformed infrared (FTIR) and Raman spectroscopy reveals a stretching of Y-O bond. Electron spin resonance (ESR) shows V − center, O 2 − and Y 2+ defects. A broad photoluminescence (PL) emission with peak at~386 nm is observed when the sample is excited with 252 nm. Thermoluminescence (TL) properties of γ-irradiated Y 2 O 3 nanopowder are studied at a heating rate of 5 K s −1 . The samples prepared by using urea show a prominent and well resolved peak at~383 K and a weak one at~570 K. It is also found that TL glow peak intensity (I m1 ) at~383 K increases with increase in γ-dose up to~6.0 kGy and then decreases with increase in dose. However, glycine used Y 2 O 3 shows a prominent TL glow with peaks at 396 K and 590 K. Among the fuels, urea used Y 2 O 3 shows simple and well resolved TL glows. This might be due to fuel and hence particle size effect. The kinetic parameters are calculated by Chen's glow curve peak shape method and results are discussed in detail.

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Section: Resultsmentioning

confidence: 99%

“…It is proved to be a powerful tool to obtain the elemental composition ratio [24] as shown in [5,23]. The peaks at 674, 854 and 1381, 1525 cm −1 are attributed to C-O bond bending [25] and C-O bond stretching, the peaks at 1633 and 1753 cm −1 are due to C = O stretching [25,26].…”

Section: Fe-sem Micrograph Analysismentioning

confidence: 99%

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Shivaramu

Lakshminarasappa

Nagabhushana

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Y 2 O 3 can be used as highefficient additives and functional composite materials like yttria stabilized zirconia films [1][2][3][4]. This material could be synthesized via several methods, including cathodic electrodeposition [5][6][7][8][9], gas-phase condensation [10], precipitation [11], sol-gel [12], pyrolysis [13], solvothermal [14], and hydrothermal synthesis [15][16][17]. Among these methods, the easy and clean cathodic electrodeposition method has been proven to be a versatile and controllable technique for the preparation of nanostructured materials.…”

Section: Introductionmentioning

confidence: 99%

Yttrium Oxide Nanoparticles Prepared by Heat Treatment of Cathodically Grown Yttrium Hydroxide

et al. 2011

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An easy two-step synthetic route is reported for the manufacture of yttrium oxide nanoparticles utilizing aqueous yttrium nitrate solution. In the first step, yttrium hydroxide precursor was grown on stainless steel electrode using a simple cathodic electrodeposition at room temperature. The subsequent second step includes the thermal decomposition of yttrium hydroxide powder at different temperatures for two hours. The synthesized products were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetery (DSC), FT-IR and Raman spectroscopy. Results showed that the as-deposited Y(OH) 3 is composed of nanoparticles with grain size of approximately 40-50 nm. Cubic-structured Y 2 O 3 phase with a porous morphology was finally formed when temperature was raised to 600• C. Results suggested that the final oxide nanoparticles are crystalline and consist only of yttrium oxide phase forming agglomerates of many primary particles with average diameter around 30 nm.

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“…In view of this point, yttria is still attractive in investigations of newer and better processing routes for its synthesis in the nano-crystalline range. For the practical application of yttria-based ceramics, the synthesis of yttria powders with controlled characteristics is necessary in order to obtain a dense sintered product at a lower sintering temperature [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…These include precipitation, hydrothermal, co-precipitation, and glycothermal treatments, and electro-spray-pyrolysis and sol-gel processing [11,12]. Each of these methods has its merits and demerits.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanocrystalline yttria powder prepared by a polymer solution route

2011

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Nanometer-scaled yttria (Y2O3) powders were synthesized by a polymer solution route using polyvinyl alcohol (PVA) as an organic carrier. The PVA polymer contributed to a soft and porous powder microstructure, and homogeneous precursor gels containing PVA polymer were effective in making nanometer-sized yttria powders. In this process, the content of PVA and the calcination temperature strongly affected the microstructure and crystallization behavior of the yttria powders. The homogeneous precursors were crystallized to a stable yttria phase at 600°C for 1 h. In this paper, a simple solution technique for the fabrication of nanometer-sized yttria powders is introduced. The effects of PVA on the powder morphology and on powder specific surface area were studied. The characterization of the synthesized powders was examined by using XRD, DTA/TG, SEM, TEM, a particle size analyzer and nitrogen gas adsorption. The yttria powder synthesized from PVA with a content ratio of 4:1 revealed a crystallite size of about 15 nm with a high surface area of 34.71 m 2 /g.

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Synthesis of nanocrystalline yttria by sol–gel method

Cited by 45 publications

References 7 publications

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Yttrium Oxide Nanoparticles Prepared by Heat Treatment of Cathodically Grown Yttrium Hydroxide

Synthesis of nanocrystalline yttria powder prepared by a polymer solution route

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