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Synthesis of Fully Dense Nanostabilized Undoped Tetragonal Zirconia

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Zirconia-based materials, with very low or null doping contents (YO1.5 between 0% and 4% mol), were prepared in the form of bulk nanostructured materials through a two-step process. Nanometric powders of size-stabilized tetragonal zirconia were synthesized by the Pechini method and subsequently densified using the high-pressure field-assisted rapid sintering method at temperatures around 850°–900°C for 5 min under a pressure of ∼800 MPa. By this method, theoretical densities of ∼98% were achieved while retaining the grain size in the final product between 40 and 50 nm. The transition to the thermodynamically stable monoclinic phase was consequently prevented, allowing for the first time the synthesis of size-stabilized zirconia in a high-density bulk form.
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Document Type: Research Article

Affiliations: 1: Department of Physical Chemistry, University of Pavia, 27100, Pavia, Italy 2: Department of Earth Science, University of Milano, 20133, Milano, Italy

Publication date: July 1, 2010

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