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    An energy competition of Co3+ and Co4+ ions during spin state transition in Ca3Co4O9 complex
    (Iop Publishing Ltd, 2016) Karaman, N.; Bayri, A.; Ekmekci, S.
    The magnetic behavior of Ca3Co4O9 complex shows a very interesting phase transition at high temperature. It is probably that this ordering is due to the spin states of Co3+ and Co4+ ions. It is quite obvious that spin states of Co ions generally change as a function of temperature. We have shown that there is a strong correlation between oxidation states and ligand field parameters during spin state transitions.