Abstract
An attempt has been made to use extended X-ray absorption fine structure (EXAFS) to study the polymorphs (beta, gamma and alpha types, and ramsdellite) of manganese dioxides. The ratio of (1 × 1) tunnels to (1 × 2) tunnels for the intergrowth structure of gamma-MnO2 was found to be as high as 46.2%. The relation between the valence state of manganese ions and the threshold absorption energy (E0) was clarified andE0 was found to be in the following order: beta>gamma>alpha (K)>alpha (Ba). EXAFS presented a possibility of nondestructive analysis of the valence state of manganese ions in manganese dioxides.
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