Charge transfer in some lanthanum transition metallates with the perovskite and K2NiF4 structures: an infrared spectroscopic study

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Ion-Molecule, Ion-Ion, And Charge-Transfer Reactions, Other Nonmetallic Inorganics

Scientific paper

The electronic properties of transition metal-containing systems sometimes indirectly manifest themselves through their infrared spectra. The infrared spectra of some lanthanum and dilanthanum transition metallates have been probed either as a function of composition or applied pressure. It is suggested that there is charge transfer to and from neighboring transition metal ions. In some cases, La2CuO4 for instance, charge separation (valence localization) is manifest at ambient temperature and pressure. In others, such as LaV0.5Ni0.5O3, it is necessary to apply an external pressure in order to induce charge separation.

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