Structural stability and valence characteristics in cerium hydrothermal systems

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Journal of Solid State Chemistry

OSTI ID:478921

Li, Guangshe; Feng, Shouhua; Li, Liping ^[1]

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1. Kilin Univ., Changchun (China)

Structural stability and valence characteristics in cerium-containing hydrothermal systems were investigated by means of powder X-ray diffraction, infrared, and X-ray photoelectron spectroscopies. Different input species resulted in the stabilization of cerium in different valence states, e.g., direct formation of CeO{sub 2} and a novel phase CeOHCO{sub 3}, isostructural with LaOHCO{sub 3}. High-temperature calcination of CeOHCO{sub 3} led to the formation of CeO{sub 2} with high crystallinity and dark brown color. In cerium sulfate systems, both CeO{sub 2} and Ce(OH){sub 3} were found, whereas in nitrate system, ceria with high crystallinity existed as the most stable phase. The mechanisms of the hydrothermal crystallization were discussed and compared with the thermal decomposition reactions of cerium-containing systems.

• OSTI ID: 478921
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 126; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ABSORPTION SPECTROSCOPY
CERIUM COMPOUNDS
HYDROTHERMAL SYSTEMS
HYDROXIDES
OXIDES
PHOTOELECTRON SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
VALENCE
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY