crystal field splitting

"Crystal field splitting" means that the energy level of 3d electrons is split depending on a crystal field surrounding the 3d electrons. In the case of the perovskite structure, a transition metal having 3d electrons is located at the center of the oxygen octahedron, the energy of the e_g orbital of the 3d electrons, which is faced to the oxygen atoms, is higher than that of the t_2g orbital, which is pointing between the oxygen atoms. In an EELS spectrum, two peaks corresponding to the t_2g and e_g states due to the crystal field splitting appear when 2p electrons are excited to the 3d unoccupied band and when 1s electrons are excited to the 2p band hybridized with the 3d state.

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