Electron transfer phase transition and oxidization process in NaxCo0.44Mn0.56[Fe(CN)6]0.90 (0.00 ≤ x ≤ 1.60)

Hiroki Iwaizumi; Takayuki Shibata; Yutaka Moritomo

doi:10.1039/D1CC05727H

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Electron transfer phase transition and oxidization process in Na_xCo_0.44Mn_0.56[Fe(CN)₆]_0.90 (0.00 ≤ x ≤ 1.60)†

Hiroki Iwaizumi,^a Takayuki Shibata

^b and Yutaka Moritomo

*^acd

Author affiliations

* Corresponding authors

^a Graduate School of Pure & Applied Science, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-7571, Japan
E-mail: moritomo.yutaka.gf@u.tsukba.ac.jp

^b Faculty of Marine Technology, Tokyo University of Marine Science and Technology, Etchujima 2-1-6, Koto-ku, Tokyo 135-8533, Japan

^c Faculty of Pure & Applied Science, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-7571, Japan

^d Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

Abstract

We investigated the phase diagram of Na_xCo_0.44Mn_0.56[Fe(CN)₆]_0.90 in the entire Na concentration range of 0.00 ≤ x ≤ 1.60. We found that the compound shows an electron transfer (ET) phase transition in a wide x range of 0.19 ≤ x ≤ 1.38. The extended ET model well reproduces the variation of the [Fe²⁺(CN)₆]⁴⁻ and [Fe³⁺(CN)₆]³⁻ concentration at the phase transition. The ET phase transition reverses the oxidation process of the compound; the process is in the order of Co, Mn, and Fe (Fe, Mn, and Co) in the low (high) temperature phase.

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Article information

DOI: https://doi.org/10.1039/D1CC05727H
Article type: Communication
Submitted: 11 Oct 2021
Accepted: 11 Nov 2021
First published: 11 Nov 2021

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Chem. Commun., 2021,57, 13700-13703

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Electron transfer phase transition and oxidization process in Na_xCo_0.44Mn_0.56[Fe(CN)₆]_0.90 (0.00 ≤ x ≤ 1.60)

H. Iwaizumi, T. Shibata and Y. Moritomo, Chem. Commun., 2021, 57, 13700 DOI: 10.1039/D1CC05727H

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