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Sintering, microstructural and mechanical characterization of combustion synthesized Y2O3 and Yb3+-Y2O3

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dc.contributor.author Mangalaraja, R V
dc.contributor.author Ananthakumar, S
dc.contributor.author Mouzon, J
dc.contributor.author Lopez, M
dc.contributor.author Camurri, C P
dc.contributor.author Oden, M
dc.date.accessioned 2013-11-11T11:30:45Z
dc.date.available 2013-11-11T11:30:45Z
dc.date.issued 2009
dc.identifier.citation Journal of the Ceramic Society of Japan 117(11):1258-1262;Nov 2009 en_US
dc.identifier.issn 1882-0743
dc.identifier.uri http://ir.niist.res.in:8080/jspui/handle/123456789/722
dc.description.abstract The present work highlights the microstructural features and mechanical properties of Y2O3 prepared with and without Yb3+ doping that processed through combustion synthesis involving various organic fuels such as urea, citric acid and glycine. Properties such as powder-now, particle packing, green density, % of shrinkage, sintered density, grain size, Vicker's microhardness (H-v) and fracture toughness (K-IC) were analyzed and compared with respect to the fuel sources. The as combusted precursors were calcined at 1100 degrees C for 4 h under oxygen atmosphere to obtain fully crystalline Y2O3 powders. Cylindrical pellets were fabricated as test specimens and sintered at 1600 degrees C for 3 h. The SEM images of the sintered yttria samples show an average grain size of < 3 mu m irrespective of the fuels. However, the mechanical properties show significant dependence on the fuels used. A maximum hardness of 6.8 +/- 0.1 and 7.0 +/- 0.1 GPa was obtained for Y2O3 and Yb3+ doped Y2O3 derived from glycine fuel. Whereas the maximum fracture toughness of 2.6 +/- 0.3 MPa m(1/2) was obtained for the samples derived from urea. The Yb3+ doping found to increase the bulk hardness of yttria from 0.2 to 0.6 GPa. The study contributes to appropriately select the fuels for obtaining high dense, mechanically stable yttria ceramics through combustion process. en_US
dc.language.iso en en_US
dc.publisher Ceramic Society of Japan en_US
dc.subject Organic fuels en_US
dc.subject Nanopowders en_US
dc.subject Laser en_US
dc.subject Nanocrystalline yttria en_US
dc.subject Combustion en_US
dc.subject Sintering en_US
dc.subject Ytterbium en_US
dc.title Sintering, microstructural and mechanical characterization of combustion synthesized Y2O3 and Yb3+-Y2O3 en_US
dc.type Article en_US

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