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Journal of Nanomaterials
Volume 2009, Article ID 138490, 5 pages
Research Article

Transparent Yttrium Aluminium Garnet Obtained by Spark Plasma Sintering of Lyophilized Gels

1Departamento de Materials Nanoestructurados, Centro de Investigación en Nanomateriales y Nanotecnología (CINN), Principado de Asturias—Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Oviedo (UO), Parque Tecnológico de Asturias, 33428 Llanera, Asturias, Spain
2Fundación ITMA, Parque Tecnológico de Asturias, 33428 Llanera, Spain

Received 18 March 2009; Revised 22 May 2009; Accepted 26 June 2009

Academic Editor: Wanqin Jin

Copyright © 2009 M. Suárez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Lyophilized YAG gel, synthesized by the coprecipitation technique, has been sintered to transparency by spark plasma sintering method at . Whereas conventionally dried gels show large agglomerates, over 1 m, powders from lyophilized gels show no agglomeration with an average particle size below 100 nm. The absence of agglomerates affects on the optical properties of the sintered materials: conventionally dried powders are opaque after sintering, whereas 0.8 mm thick transparent YAG materials with in-line transmittances close to 60% at 680 nm and over 80% in the infrared range have been obtained for the lyophilized gels.