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M\"ossbauer and magnetic susceptibility measurements were performed under pressure on three Prussian blue analogs, K₀. ₁Co₄Fe (CN) ₆₂. ₇18H₂O, K₀. ₂₈Co₄Fe (CN) ₆₂. ₇₆18H₂O, and Cs₀. ₇Co₄Fe (CN) ₆₂. ₉16H₂O. A pressure-induced electron transfer Co^2+ (S=32) -Fe^3+ (S=12) Co^3+ (S=0) -Fe^2+ (S=0) was found. The ``scanning'' of the ligand field strength by applying an external hydrostatic pressure allows the exploration of the distribution of CoN₍O₆-₍ (0<~n<~6) configurations. It reveals a narrow distribution of configurations centered around the most probable CoN₄O₂ configuration in K₀. ₁Co₄Fe (CN) ₆₂. ₇18H₂O and a broad CoN₍O₆-₍ distribution in K₀. ₂₈Co₄Fe (CN) ₆₂. ₇₆18H₂O and Cs₀. ₇Co₄Fe (CN) ₆₂. ₉16H₂O. This evolution of site distribution caused by alkali doping, explored here for the first time, to our knowledge is shown to play an important role in the photoinduced magnetization process.
Ksenofontov et al. (Mon,) studied this question.
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