Hydrothermal Synthesis and Characterization of Nanometer Ce1-xCoxO2-δ Solid Solutions

Chem. J. Chinese Universities

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Hydrothermal Synthesis and Characterization of Nanometer Ce_1-xCo_xO_2-δ Solid Solutions

ZHANG Guo-Fang^1,3, XUE Yan-Feng², XU Jiao-Xing¹, QIU Xiao-Qing¹, LI Guang-She¹, LI Li-Ping^1*

1. State Key Structural Chemistry Laboratory, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;
2. College of Physics, Jilin University, Changchun 130023, China;
3. Graduate School, Chinese Academy of Science, Beijing 100049, China

Received:2006-09-04 Revised:1900-01-01 Online:2007-04-10 Published:2007-04-10
Contact: LI Li-Ping

Abstract

Abstract: Using (NH₄)₂S₂O₈ and NH₄OH as the oxidizer and chelating agent, respectively, Ce_1-xCo_xO_2-δ solid solutions were synthesized under hydrothermal conditions and the optimum preparation parameters were explored. The obtained solid solutions had a cubic fluorite structure, and the average particle size was about 4 nm. The lattice parameter monotonously decreased with increasing the cobalt content. The solubility of x=0.06 was determined by combining XRD and Raman techniques. Cobalt ions are found to be in a mixed valence state of Co²⁺/ Co³⁺ in CeO₂ lattice. Increasing the cobalt content resulted in a clear blue shift of the absorption threshold edge and an increase of bulk conductivity.

Key words: Hydrothermal synthesis, Cobalt doping, Oxygen vacancy, Solubility

CLC Number:

O614.33

TrendMD:

ZHANG Guo-Fang^1,3, XUE Yan-Feng², XU Jiao-Xing¹, QIU Xiao-Qing¹, LI Guang-She¹, LI Li-Ping^1*. Hydrothermal Synthesis and Characterization of Nanometer Ce_1-xCo_xO_2-δ Solid Solutions[J]. Chem. J. Chinese Universities, doi: .

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Hydrothermal Synthesis and Characterization of Nanometer Ce_1-xCo_xO_2-δ Solid Solutions

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