title: EXAFS study of phase transitions in KIO3.
abstract: The iodine K-edge EXAFS study of KIO3 was performed to clarify local structural changes on the successive phase transitions. The pair-distribution function of three oxygen atoms in an oxygen octahedron is almost independent on temperature like a covalent bond, whereas that of the other three is gradually reduced with increasing temperature like an ionic bond. The result indicates that iodine and oxygen atoms exist as an IO3- molecule in a pseudo-perovskite-type structure. The anomalous behavior in the Debye-Waller factor for the latter pair-distribution function appears around 50 K, which is associated with the orientational glass transition.
authors.affiliation: Advanced Research Center of Science and School of Science, Kwansei-Gakuin University, Sanda, Hyogo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yagi
authors.forename: S
authors.initials: S
authors.lastname: Umezawa
authors.forename: H
authors.initials: H
authors.lastname: Terauchi
authors.forename: H
authors.initials: H
authors.lastname: Kasatani