Local structure of a trapped photoexcited state of a Fe-Co cyanide studied by x-ray-absorption fine-structure spectroscopy

Toshihiko Yokoyama, Manabu Kiguchi, Toshiaki Ohta, Osamu Sato, Yasuaki Einaga, Kazuhito Hashimoto

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

The local structure of a trapped photoexcited state of a Fe-Co cyanide magnetic material, Na0.4Co1.3Fe(CN)6·5H2O, was investigated by Fe and Co K-edge x-ray-absorption fine-structure spectroscopy. The excited state was prepared by visible-light irradiation at 36 K. In order to obtain detailed structural information, temperature dependence of the local structure was also studied without light irradiation. The Fe-C distance shows almost no change by light irradiation (1.92 Å before and after irradiation), while the average Co-N/O distance is noticeably elongated (1.94 and 2.08 Å before and after irradiation, respectively). This phase transformation is caused by the charge transfer from the FeII(S=0)·CN-CoIII(S=0) configuration to FeIII(S =1/2)-CN-CoII(S=3/2). The local structure of the trapped photoexcited state was found to be identical with that of the high-temperature phase, although the high-temperature phase was created much more effectively by light irradiation than thermal activation.

Original languageEnglish
Pages (from-to)9340-9346
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number13
Publication statusPublished - 1999
Externally publishedYes

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Cyanides
cyanides
x ray absorption
fine structure
Irradiation
Spectroscopy
X rays
irradiation
spectroscopy
Magnetic materials
magnetic materials
Excited states
Temperature
phase transformations
Charge transfer
Phase transitions
Chemical activation
charge transfer
activation
temperature dependence

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Local structure of a trapped photoexcited state of a Fe-Co cyanide studied by x-ray-absorption fine-structure spectroscopy. / Yokoyama, Toshihiko; Kiguchi, Manabu; Ohta, Toshiaki; Sato, Osamu; Einaga, Yasuaki; Hashimoto, Kazuhito.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 60, No. 13, 1999, p. 9340-9346.

Research output: Contribution to journalArticle

Yokoyama, Toshihiko ; Kiguchi, Manabu ; Ohta, Toshiaki ; Sato, Osamu ; Einaga, Yasuaki ; Hashimoto, Kazuhito. / Local structure of a trapped photoexcited state of a Fe-Co cyanide studied by x-ray-absorption fine-structure spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 1999 ; Vol. 60, No. 13. pp. 9340-9346.
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AU - Einaga, Yasuaki

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