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Title: Solvothermal nanoYAG synthesis: mechanism and particle growth kinetics
Authors: Ramanujam, Prabhu
Vaidhyanathan, Bala
Binner, J.G.P.
Ghanizadeh, Shaghayegh
Spacie, Chris
Keywords: Yttrium aluminium garnet
Growth kinetics
Issue Date: 2016
Publisher: © Elsevier
Citation: RAMANUJAM, P. ... et al, 2016. Solvothermal nanoYAG synthesis: mechanism and particle growth kinetics. Journal of Supercritical Fluids, 107, pp. 433 - 440.
Abstract: NanoYAG particles with spherical morphology have been synthesised using a solvothermal method; a structure sensitive reaction, where the chemical reaction and the particle growth kinetics are interdependent. It has been observed that the primary YAG particles agglomerated into ∼30 nm clusters via a self-assembled Ostwald ripening process along (2 1 1) planes, separated by a distance of ∼0.49 nm, at 270 °C and 2.0 MPa for 2 h. These nanoclusters coalesced into single nanoparticles of ∼30 nm in size and exhibited a smaller inter planar distance of ∼0.26 nm, corresponding to the (4 2 0) planes, when synthesized at 300 °C and 8.5 MPa for 2 h. in addition, the solvent 1,4-butanediol transformed into 1,4-diacetoxybutane, this will have undergone esterification by reacting with the terminal acetate groups cleaved from the precursor, yttrium acetate. The proposed mechanism based on the analytical evidence suggests that a complete dissolution of precursors facilitated the structural re-arrangement of atoms within the planes and lead to a significantly higher degree of crystallinity. Moreover, once the particles with (4 2 0) planes had formed, they were no longer involved in facile coalescence along their preferential planes due to their lower interfacial energy compared to the (2 1 1) planes. This led to control of the particle morphology and with little agglomeration occurring in the final nanopowder.
Description: This paper was accepted for publication in the journal Journal of Supercritical Fluids and the definitive published version is available at http://dx.doi.org/10.1016/j.supflu.2015.09.031
Sponsor: The authors would like to thank Morgan Advanced Materials, Swansea, UK, and Loughborough University Studentship for financial support.
Version: Accepted for publication
DOI: 10.1016/j.supflu.2015.09.031
URI: https://dspace.lboro.ac.uk/2134/19849
Publisher Link: http://dx.doi.org/10.1016/j.supflu.2015.09.031
ISSN: 0896-8446
Appears in Collections:Published Articles (Materials)

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