J. Phys. Colloques
Volume 47, Numéro C8, Décembre 1986EXAFS and Near Edge Structure IV
|Page(s)||C8-737 - C8-740|
J. Phys. Colloques 47 (1986) C8-737-C8-740
EXAFS AND XANES STUDY ON SPINEL STRUCTURE MATERIALS AND THEIR APPLICATION TO HUMIDITY SENSORT. OKAMATO, T. SUZUKI et N. MATSUI
Toyota Central Research and Development Laboratories, Inc. Nagakute-cho, Aichi-ken, Japan
The deterioration mechanism of the humidity sensors were investigated by Fe K-EXAFS and XANES. The humidity sensors were composed of spinel structure materials , Zn0.98Na0.02Fe 2O4. and Mg0.98Na0.02Fe2O4. The former is excellent in durability, while the latter is poor. It was suggested that the deterioration of Mg0.98Na0.02Fe2O4 is attributable to the movement of Fe atoms. It was shown that a laboratory scale equipment is extremely useful tool to study not only the atomic radial distribution, but also the coordination geometry around excited atoms.