Microwave-induced combustion synthesis and electrical conductivity of Ce{sub 1-x}Gd {sub x}O{sub 2-1/2x} ceramics
- Department of Materials Science and Engineering, National Dong-Hwa University, Shou-Feng, Hualien 974, Taiwan (China)
- Department of Resources Engineering, National Cheng Kung University, Tainan 701, Taiwan (China)
Ce{sub 1-x}Gd {sub x}O{sub 2-1/2x} nanopowder were successfully synthesized by microwave-induced combustion process. For the preparation, cerium nitrate, gadolinium nitrate hexahydrate, and urea were used for the microwave-induced combustion process. The process took only 30 min to obtain Ce{sub 1-x}Gd {sub x}O{sub 2-1/2x} powders. The exo-endo temperature, phase identification, and morphology of resultant powders were investigated by TG/DTA, XRD, and SEM. The as-received Ce{sub 1-x}Gd {sub x}O{sub 2-1/2x} powders showed that the average particle size ranged from 18 to 50 nm, crystallite dimension varied from 11 to 20 nm, and the specific surface area was distribution from 16 to 46 m{sup 2}/g. As for Ce{sub 1-x}Gd {sub x}O{sub 2-1/2x} ceramics sintered at 1450 deg. C for 3 h, the bulk density of Ce{sub 1-x}Gd {sub x}O{sub 2-1/2x} ceramics were over 91% of the theoretical density, the maximum electrical conductivity, {sigma} {sub 700deg.C} = 0.017 S/cm with minimum activation energy, E {sub a} = 0.869 eV was found at Ce{sub 0.80}Gd{sub 0.20}O{sub 1.90} ceramic.
- OSTI ID:
- 20895200
- Journal Information:
- Materials Research Bulletin, Vol. 41, Issue 12; Other Information: DOI: 10.1016/j.materresbull.2006.04.016; PII: S0025-5408(06)00150-4; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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