Low-Temperature Direct Synthesis of Nanoparticles of Fluorite-Type Ceria-Zirconia Solid Solutions by ''Forced Cohydrolysis'' at 100{degree}C

Journal Article · Sun Apr 01 04:00:00 EDT 2001 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.2000.9106· OSTI ID:784367

Hirano, Masanori; Miwa, Toshio; Inagaki, Michio

Nanometer-sized particles ranging from 2 to 3 nm of CeO{sub 2} (ceria)-ZrO{sub 2} (zirconia) solid solutions with cubic and/or tetragonal fluorite-type structure in the wide composition range from 20 to 100 mol% CeO{sub 2}, without a trace of monoclinic ZrO{sub 2} phase, could be directly synthesized at low temperature of 100 C from acidic aqueous solutions of ZrOCl{sub 2} and (NH{sub 4}){sub 2}Ce(NO{sub 3}){sub 6} by forced simultaneous hydrolysis, i.e., ''forced cohydrolysis.'' Analytical values of CeO{sub 2}/ZrO{sub 2} ratio in the as-precipitated solid solutions showed fairly good agreement with starting compositions in the solutions. The proceeding of the hydrolysis and formation rate of fluorite-type solid solutions tended to slow down at near median composition. Any change in crystalline phase of as-precipitated solid solutions was not observed by powder X-ray diffractometry after heat treatment in air below 1000 C. Ceria-zirconia solid solutions with fluorite structures containing large amount of ZrO{sub 2} maintained high surface area after heat treatment at 1000 C.

• Research Organization: Department of Applied Chemistry, Aichi Institute of Technology, Yachigusa, Yakusa, Toyota (JP)
• Sponsoring Organization: Kyoritsu Ceramic Materials Co., Ltd., Nagoya (JP)
• OSTI ID: 784367
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 158; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AFTER-HEAT
AIR
AQUEOUS SOLUTIONS
CERIUM OXIDES
CHEMICAL PREPARATION
CUBIC LATTICES
EXPERIMENTAL DATA
FLUORITE
HEAT TREATMENT
HYDROLYSIS
SOLID SOLUTIONS
SURFACE AREA
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
TETRAGONAL LATTICES
X-RAY DIFFRACTION
ZIRCONIUM OXIDES