Electron transfer phase transition and oxidization process in NaCoMn[Fe(CN)] (0.00 ≤ ≤ 1.60).

We investigated the phase diagram of NaCoMn[Fe(CN)] in the entire Na concentration range of 0.00 ≤ ≤ 1.60. We found that the compound shows an electron transfer (ET) phase transition in a wide range of 0.19 ≤ ≤ 1.38. The extended ET model well reproduces the variation of the [Fe(CN)] and [Fe(CN)] 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.