Synthesis of yttrium aluminum garnet nanoparticles in confined environment II: Role of the thermal treatment on the composition and microstructural evolution

Armetta, Francesco; Saladino, Maria Luisa; Martino, Delia Chillura; Livreri, Patrizia; Caponetti, Eugenio

doi:10.1016/j.jallcom.2017.05.174

Cited by 11 publications

(6 citation statements)

References 33 publications

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“…The assistance of urea in creating a reducing atmosphere during the YAG formation is somehow confirmed by the XRD patterns of sample prepared at R = 2, where the formation of the YAG phase cannot be observed even at T = 900 °C (only traces of yttria can be seen). On the other end, in agreement with the IR data, these findings evidence the role of urea, which probably partially bond the aluminium and affect its availability to participate to the crystallization process, involving the formation of yttria, as previously reported in the case of YAG nanoparticles prepared in microemulsion 25,26 .…”

Section: Discussion Of Resultssupporting

confidence: 91%

Non-conventional Ce:YAG nanostructures via urea complexes

Armetta

Saladino

Giordano

et al. 2019

Sci Rep

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Ce:YAG nanostructures (Ce:YAG = Cerium in Yttrium Aluminium Garnet), easy to control and shape, have been prepared via templating approach using natural and synthetic materials (i.e. paper, cotton wool and glass wool) previously soaked with a gel-like metals precursor and then thermally treated to achieve the wished morphology. The final material, otherwise difficult to process, can be easily moulded, it is lightweight, portable and forms, at the nanoscale, homogeneous layers of interconnected but not agglomerated nanoparticles (15 ± 5 nm). Using the same synthetic route, called Urea-Glass-Route, but in absence of a template, extremely pure Ce:YAG nanoparticle (45 ± 5 nm) can be also prepared, highly crystalline and well-defined in size and shape. Both structural and optical properties of the final materials were investigated, showing high optical quality. The support allows the production of a multifunctional material with mouldable shape and potential lighting application for large structures combining the strength, chemical durability, fire resistance, and translucency of glass fibres. Last, but not least, the synthetic path also allows an easy scaling up of the process: the first, key step for practical application of nanosized rare-earth doped YAG on large scale.

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Section: Discussion Of Resultssupporting

confidence: 91%

Non-conventional Ce:YAG nanostructures via urea complexes

Armetta

Saladino

Giordano

et al. 2019

Sci Rep

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“…This study clearly indicates that at T < 650 8C( regardless of R M ), the structure is closer to that of pure ZnO (although peaks of as econdary phasea re also observed), somehow suggesting that the formation of the oxide phase takes place first and then the incorporation of Ga ions occurs in as econd step, only at temperatures above 700 8C. As imilarr esult was observed by Armetta et al [30] fort he formation of yttrium aluminum garnet (YAG) nanoparticles prepared by co-precipitation in microemulsion and calcination at high temperature by the Kirkendall effect. [31] The formationo fa no xide intermediate phase using UGR has been also previously observed for the synthesis of TiN.…”

Section: Resultssupporting

confidence: 84%

Multimetallic Oxynitrides Nanoparticles for a New Generation of Photocatalysts

Rao

Saladino

Fang

et al. 2019

Chemistry A European J

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Av ersatile synthetic strategy for the preparation of multimetallic oxynitrides has been designeda nd here exemplarily discussed considering the preparation of nanoscaled zinc-gallium oxynitrides and zinc-gallium-indium oxynitrides, two important photocatalysts of new generation, which proved to be active in key energy relatedp rocesses from pollutant decomposition to overall water splitting. The synthesis presented here allows the preparation of small nanoparticles (less than 20 nm in average diameter), well-defined in size and shape, yet highly crystalline and with the highest surfacea rea reported so far (up to 80 m 2 g À1 ). X-ray diffraction studies show that the final mate-rial is not am ixture of singleo xidesb ut ad istinctive compound. The photocatalytic propertieso ft he oxynitrides have been tested towards the decomposition of an organic dye (as am odel reaction for the decomposition of air pollutants), showingb etter photocatalytic performances than the corresponding pure phases (reaction constant 0.22 h À1 ), whereas almost no reactionw as observed in absence of catalyst or in the dark. The photocatalystsh ave been also testedf or H 2 evolution (semi-reactiono ft he waters plittingp rocess) with results comparable to the best literature values butl eaving room for further improvement.Supporting information and the ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.

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“…The obtained values of cell parameter for the YAGG lattice are due to the difference in ionic radii between Ga 3+ and Al 3+ ions (Ga 3+ : 47 pm in tetrahedral site, 62 pm in octahedral site; Al 3+ : 39 pm in tetrahedral site, 53.5 pm in octahedral site) 41 and thus are in agreement with the hypothesis of formation of YAGG phase having Y:Al:Ga atomic ratio equal to 3:2:3. The cubic cell parameter (a) decreases with increasing the annealing temperature was observed even for YAG powders doped with erbium or europium 31,42 and this behaviour was attributed to the removal of vacancies or impurities [42][43][44][45][46] . It could also depend on a homogeneous disorder introduced into the lattice during the amorphous to crystalline transformation and on an imperfect local stoichiometry.…”

Section: Resultsmentioning

confidence: 98%

Particle size-related limitations of persistent phosphors based on the doped Y3Al2Ga3O12 system

Boiko

Dai

Markowska

et al. 2021

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Co-doped Ce3+, Cr3+ and Pr3+ yttrium–aluminium–gallium garnet powders of various sizes were obtained by co-precipitation method. The microstructure and morphology were investigated by XRPD, TEM and gas porosimetry. The luminescence properties were studied by excitation and emission spectra, quantum yield and decay times. Thermoluminescence measurements were performed to evaluate the activation energy, traps redistribution and frequency factor. Limitation in the energy transfer between dopant ions in the small particles, traps depth and surface defects were considered and investigated as responsible for the quenching of persistent luminescence. The phosphors annealed at 1100 °C show the optimal persistent luminescence and nano-particle size.

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Synthesis of yttrium aluminum garnet nanoparticles in confined environment II: Role of the thermal treatment on the composition and microstructural evolution

Cited by 11 publications

References 33 publications

Non-conventional Ce:YAG nanostructures via urea complexes

Non-conventional Ce:YAG nanostructures via urea complexes

Multimetallic Oxynitrides Nanoparticles for a New Generation of Photocatalysts

Particle size-related limitations of persistent phosphors based on the doped Y3Al2Ga3O12 system

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