Solvothermal nanoYAG synthesis: Mechanism and particle growth kinetics

Ramanujam, Prabhu; Vaidhyanathan, Bala; Binner, Jon; Ghanizadeh, Shaghayegh; Spacie, Chris

doi:10.1016/j.supflu.2015.09.031

Cited by 20 publications

(28 citation statements)

References 38 publications

(40 reference statements)

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“…Details of the synthesis method are provided elsewhere [19,20], but, in brief, the powder was synthesised from an aluminium chloride and ammonia solution using a precipitation-based method followed by a two-step heat treatment route to prevent the high degree of agglomeration occurring during conversion of the precursors into metal oxides [21].…”

Section: Methodsmentioning

confidence: 99%

Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders

Ghanizadeh

Grasso

Ramanujam

et al. 2017

Ceramics International

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Citation: GHANIZADEH, S. ...et al., 2017. Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders.Ceramics International, 43 (1), Part A, pp. 275-281.Additional Information:• This paper was accepted for publication in the journal Ceram- This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractNanocrystalline alumina powder with an average crystallite size of ≤50 nm has been consolidated by spark plasma sintering (SPS) and hot pressing (HP) with a view to achieving dense, fine grained alumina bodies that display transparency. When as-synthesised powder was densified directly, excessive grain growth resulted from both the SPS and HP techniques and hence a large final grain size was observed. Attempts to improve the uniformity of the green microstructure prior to densification were unsuccessful when spray freeze dried granules were used, whether pre-pressed into a compact or not. The use of 53% dense slip cast green compacts, however, enabled final density of ~99.96% and a mean grain size of ~0.32 μm to be achieved when SPS conditions of 1200˚C and 500 MPa were 2 applied for 20 minutes. These samples offered in-line transmittance values of up to ~80%and microhardness values of 22 GPa.

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Section: Methodsmentioning

confidence: 99%

Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders

Ghanizadeh

Grasso

Ramanujam

et al. 2017

Ceramics International

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“…The structure of YAG is composed of yttrium ions located at body-centered in the dodecahedron sites and aluminum ions located at tetrahedral and octahedral sites to form three kinds of coordination with oxygen, i.e. YO 8 , AlO 6 and AlO 4 prisms [7] . For precursor, the wide band at 3450 cm -1 can be assigned to O-H stretching vibration and ~1650 cm -1 to O-H bending vibration of the crystal water and absorbed water [17,22] .…”

Section: Reaction Process From Gel To Powdermentioning

confidence: 99%

“…There are two other YAlO 3 polymorphs, yttrium aluminum hexagonal (YAH) and cubic YAlO 3 garnet [3] , found only in chemically synthesized powders [1,4] . Polycrystalline YAG materials have excellent physical, chemical, thermal, mechanical and optical properties with a lot of structural and functional applications [5][6][7][8][9][10][11][12][13] . Various wet-chemical methods have been developed and successfully used to synthesize pure and / or doped YAG.…”

Section: Introductionmentioning

confidence: 99%

“…Various wet-chemical methods have been developed and successfully used to synthesize pure and / or doped YAG. These involve precipitation [1,4,7,9,[14][15][16][17][18][19][20][21][22][23][24][25] , sol-gel [1,17,[26][27][28] , citrate gel [29] , hydrothermal [30] , solvothermal [6,31] , supercritical water [32,33] , combustion [34,35] , spray-pyrolysis [36,37] , microemulsion [38] , microwave irradiation [39] and modified Pechini routes [40] . Among them, precipitation method is one of the most commonly used techniques, because homogeneous multi-element compounds from which can be prepared effectively on a large scale and final products with improving phase purity can be formed at the temperature below 1000 °C.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of cubic yttrium aluminum garnet (YAG) powders by co-precipitation and two-step calcinations

Girish¹,

Zhu²,

F.³

et al. 2017

AIP Conference Proceedings

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Abstract. YAG powders were synthesized by co-precipitation and two-step moderate calcinations at 600 / 800 °C or 600 / 900 °C in air, respectively. Two kinds of the synthesized powders both possess pure cubic YAG phases without any secondary phases such as YAH, YAP and YAM, etc.. The former has low agglomeration with nano-sized primary particles and large active energy, and the latter has homogeneously dispersed and well-crystallized particles, with a narrow particle size distribution of 8 -13 μm.

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“…Therefore this work used nanopowders of ITO (with 10 at% Sn) that were directly synthesised as nanoparticles dispersed in a liquid media, using a continuous hydrothermal flow synthesis (CHFS) method, as discussed in previous work [4,18,19]. The effect of the addition of different dispersants on the level of agglomeration of the nanopowders along with a comparative study of conventional and microwave heating techniques on the characteristics of the films was investigated.…”

Section: Introductionmentioning

confidence: 99%

Dispersion and microwave processing of nano-sized ITO powder for the fabrication of transparent conductive oxides

Ghanizadeh

Peiris

Jayathilake

et al. 2016

Ceramics International

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Aqueous dispersions of tin-doped indium oxide (ITO) nanopowder were prepared and the effect of the addition of PEG 400, Tween 80 and β-alanine as dispersants was investigated using zeta potential and particle size distribution measurements. Both PEG 400 and β-alanine were found to produce stable dispersions that were used to deposit ITO thin films on glass substrates by dip and spin coating methods. The ITO thin films were heat-treated using both conventional and microwave heat treatment in order to improve the inter-particle connections and hence the resistivity and transparency of the films. All the films exhibited an average transmittance of >80% over the visible spectrum after being subjected to the heat treatment process. ITO films prepared with no dispersant showed very high resistivity values for both heating methods, however addition of 2 wt% PEG 400 to the dispersion yielded a reduction in the resistivity values to 1.4 × 10 -1 Ω cm and 3.8 × 10 -2 Ω cm for conventionally and microwave treated films, respectively. The surface morphological studies confirmed that addition of dispersants improved the film uniformity and inter-particle connections of the ITO films considerably.

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Solvothermal nanoYAG synthesis: Mechanism and particle growth kinetics

Cited by 20 publications

References 38 publications

Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders

Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders

Synthesis of cubic yttrium aluminum garnet (YAG) powders by co-precipitation and two-step calcinations

Dispersion and microwave processing of nano-sized ITO powder for the fabrication of transparent conductive oxides

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