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Densification and polymorphic transition of multiphase Y2O3 nanoparticles during spark plasma sintering

Abstract : Multiphase (MP) monoclinic and cubic Y2O3 nanoparticles, 40 nm in diameter, were densified by spark plasma sintering for 5-15 min and100 MPa at 1000 °C, 1100 °C, and 1500 °C. Densification started with pressure increase at room temperature. Densification stagnated during heating compared to the high shrinkage rate in cubic single-phase reference nanopowder. The limited densification of the MP nanopowder originated from the vermicular structure (skeleton) formed during the heating. Interface controlled monoclinic to cubic polymorphic transformation above 980 °C led to the formation of large spherical cubic grains within the vermicular matrix. This resulted in the loss of the nanocrystalline character and low final density.
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https://hal.archives-ouvertes.fr/hal-00720725
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Submitted on : Wednesday, July 25, 2012 - 3:04:05 PM
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Rachel Marder, Rachman Chaim, Geoffroy Chevallier, Claude Estournès. Densification and polymorphic transition of multiphase Y2O3 nanoparticles during spark plasma sintering. Materials Science and Engineering: A, Elsevier, 2011, vol.528, pp. 7200-7206. ⟨10.1016/j.msea.2011.06.044⟩. ⟨hal-00720725⟩

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