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Single-step densification of nanocrystalline CeO2 by the cold sintering process |
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| Authors: | Thomasina H. Zaengle Arnaud Ndayishimiye Kosuke Tsuji Zhongming Fan Sun Hwi Bang Jonathan Perini Scott T. Misture Clive A. Randall |
| Affiliation: | 1. Kazuo Inamori School of Engineering, Alfred University, Alfred, NY, USA;2. Materials Research Institute, The Pennsylvania State University, University Park, PA, USA;3. Materials Research Institute, The Pennsylvania State University, University Park, PA, USA Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA;4. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA |
| Abstract: | This study reports the successful single-step cold sintering of nanocrystalline cerium dioxide (CeO2) at temperatures ranging from 250°C to 400°C under 500 MPa, using molten hydroxides flux solvents. CeO2 ceramics obtained were 82 to 91% of the theoretical density. Structural and microstructural investigations of the as-cold sintered CeO2 ceramics were conducted to further understand this new approach to cold sinter ceramics. Electrical conductivity measured by two-point AC impedance demonstrated an activation energy for grain conductivity of 0.49 eV, with impedance spectra characteristic of nanoscale CeO2. |
| Keywords: | ceramics cold sintering fluxes fuel cells hydroxides |