Inverse Charge Transfer in the Quadruple Perovskite CaCu3Fe4O12
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Structural and spectroscopic analyses revealed that the quadruple perovskite CaCu3Fe4O12 undergoes an “inverse” electron charge transfer in which valence electrons move from B-site Fe to A′-site Cu ions (∼3Cu∼2.4+ + 4Fe∼3.65+ → ∼3Cu∼2.2+ + 4Fe∼3.8+) simultaneously with a charge disproportionation transition (4Fe∼3.8+ → ∼2.4Fe3+ + ∼1.6Fe5+), on cooling below 210 K. The direction of the charge transfer for CaCu3Fe4O12 is opposite to those reported for other perovskite oxides such as BiNiO3 and ACu3Fe4O12 (A = Sr2+ or the large trivalent rare-earth metal ions), in which the electrons move from A/A′-site to B-site ions. This finding sheds a light on a new aspect in intermetallic phenomena for complex transition metal compounds.
创建时间：
2016-02-10
