Microstructure and electrical properties of nano-sized Ce1-xGdxO2 (0 ≤ x ≤ 0.2) particles prepared by spray pyrolysis

Nano-sized Ce 1-x Gd x Ο 2 (0 ≤ x ≤ 0.2) particles were prepared by spray pyrolysis process from the spray solution with ethylene glycol. The mean sizes of Ce 1-x Gd x O 2 (x = 0, 0.05, 0.1, 0.2) particles were each 46, 33, 29, and 28 nm. The mean crystallite size of pure CeO 2 was 33 nm. However, the Gd-doped CeO 2 had the mean crystallite size of 28 nm irrespective of the molar ratio of Gd to Ce components. The mean grain size of the sintered CeO 2 pellet was about two or four times larger than those of the Gd-doped CeO 2 pellets. The mean grain sizes of Ce 0.9 Gd 0.1 O 2 and Ce 0.8 Gd 0.2 O 2 pellets are about 0.5-0.4 μm. The pure CeO 2 pellet had low relative density of 80%. However, Ce 0.9 Gd 0.1 Ο 2 and Ce 0.8 Gd 0.2 O 2 pellets had the high relative densities above 95%. The Ce 0.9 Gd 0.1 Ο 2 and Ce 0.8 Gd 0.2 O 2 pellets had similar conductivities at all measuring temperatures. The Ce 0.9 Gd 0.1 Ο 2 pellet had conductivities of 4.73 x 10 -2 and 1.16 x 10 -1 Scm -1 at measuring temperatures of 800 and 900°C respectively.

[1]  S. Kuharuangrong.  Ionic conductivity of Sm, Gd, Dy and Er-doped ceria , 2007 .

[2]  Seung-Bin Park,et al.  The characteristics of nano-sized Gd-doped CeO2 particles prepared by spray pyrolysis , 2005 .

[3]  T. Mahata,et al.  Combustion synthesis of gadolinia doped ceria powder , 2005 .

[4]  K. Hirota,et al.  Characterization and Sintering of Reactive Cerium(IV) Oxide Powders Prepared by the Hydrazine Method , 2005 .

[5]  L. Gao,et al.  Synthesis of solid, spherical CeO2 particles prepared by the spray hydrolysis reaction method , 2004 .

[6]  Santanu Basu,et al.  Synthesis and properties of nanocrystalline ceria powders , 2004 .

[7]  A. K. Tyagi,et al.  Ultrafine ceria powders via glycine-nitrate combustion , 2001 .

[8]  Ziyu Wu,et al.  Structural Characteristics of Cerium Oxide Nanocrystals Prepared by the Microemulsion Method , 2001 .

[9]  J. R. Jurado,et al.  Present several items on ceria-based ceramic electrolytes: synthesis, additive effects, reactivity and electrochemical behaviour , 2001 .

[10]  J. H. Lee,et al.  Characterization and sintering of nanocrystalline CeO2 powders synthesized by a mimic alkoxide method , 2001 .

[11]  Harry L. Tuller,et al.  Ionic conduction in nanocrystalline materials , 2000 .

[12]  Brian C. H. Steele,et al.  Appraisal of Ce1−yGdyO2−y/2 electrolytes for IT-SOFC operation at 500°C , 2000 .

[13]  Mogens Bjerg Mogensen,et al.  Physical, chemical and electrochemical properties of pure and doped ceria , 2000 .

[14]  Jackie Y. Ying,et al.  Defect and transport properties of nanocrystalline CeO2-x , 1996 .

[15]  J. Ying,et al.  Catalytic redox activity and electrical conductivity of nanocrystalline non-stoichiometric cerium oxide , 1996 .

[16]  L. Schmidt,et al.  Sintering of Sol—Gel-Prepared Submicrometer Particles Studied by Transmission Electron Microscopy , 1993 .

[17]  I. Chen,et al.  Reactive Cerium(IV) Oxide Powders by the Homogeneous Precipitation Method , 1993 .

[18]  Takanori Inoue,et al.  Electrical properties of ceria-based oxides and their application to solid oxide fuel cells , 1992 .

[19]  H. Yahiro,et al.  Electrical properties and reducibilities of ceria−rare earth oxide systems and their application to solid oxide fuel cell , 1989 .

[20]  H. Tuller,et al.  Doped Ceria as a Solid Oxide Electrolyte , 1975 .

[21]  Hideaki Inaba,et al.  Ceria-based solid electrolytes , 1996 .

[22]  M. Hirano,et al.  The hydrothermal synthesis of ultrafine cenum(w) oxide powders , 1996 .