Preparation and characterization of Bi0.75Er0.25O1.5 and Bi0.75Er0.125Y0.125O1.5 nanocrystalline ceramics by SPS
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Nanopowders of Bi0.75Er0.25O1.5 and Bi0.75Er0.125Y0.125O1.5 were prepared by a reverse titration chemical coprecipitation method under controlled pH conditions. After calcination at 500 °C for 3 h, powders with grain size in the order of 10 nm were obtained. In order to keep the nanosize of grains, these powders were densified by spark plasma sintering. Samples with relative density higher than 96% were prepared in only 10 min up to 500 °C with an average grain size of 15 and 11 nm for Bi0.75Er0.25O1.5 and Bi0.75Er0.125Y0.125O1.5, respectively. Impedance spectroscopy revealed slightly higher conductivity for the Bi0.75Er0.125Y0.125O1.5 composition compared to Bi0.75Er0.25O1.5 nanoceramic, but performances remained lower than the corresponding Bi0.75Er0.25O1.5 microcrystalline sample. However, mechanical properties of both nanocrystalline ceramics are improved when compared to microcrystalline samples.
KeywordsBi2O3–Er2O3 Bi2O3–Er2O3–Y2O3 Nanocrystalline ceramic SPS Ion conductivity Mechanical properties
Authors are grateful to the French Embassy in China for funding R. Li grant as a co-tutorial Ph.D. between Shanghai University and the University of Lille. The authors also thank the Instrument Analysis Research Center of Shanghai University for their help in the characterization of materials (SEM, TEM, XRF) and Claude Estournes and his collaborators at the Plate-forme Nationale de Frittage Flash (PNF2) in Toulouse for their help during the sample sintering. The Leading Academic Discipline Project of Shanghai Municipal Education Commission (No. J50102), Key Project of Ministry of Education, China (No. 208043), Key Project of Shanghai Education Committee (No. 07zz10), and Magnolia Science and Technology Talent Fund (No. 2008B049) are also gratefully acknowledged for their funding.
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