DETERMINATION OF MIXING OF 4F-LIGAND ORBITALS IN CE(SO4)2 BY XANES IS CE(SO4)2 A MIXED VALENT INSULATING SYSTEM
DETERMINATION OF MIXING OF 4F-LIGAND ORBITALS IN CE(SO4)2 BY XANES IS CE(SO4)2 A MIXED VALENT INSULATING SYSTEM
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DOI：
10.1016/0304-8853(85)90396-8
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发表时间：
1985-01-01
影响因子：
2.7
通讯作者：
DAVOLI, I
中科院分区：
文献类型：
--
作者：
BIANCONI, A;MARCELLI, A;DAVOLI, I
测量了绝缘镧和铈4f 0和4f 1化合物的高分辨XANES谱。我们证明了在XANES中，末态效应如电荷转移卫星（末态组态相互作用）被猝灭，而Ce（SO_4）_2的LIII-和LI-XANES中的芯激发分裂如CeO_2中的是由于初态组态相互作用.我们表明，基态电子结构的形式Ce 4+化合物是由混合的多电子配置涉及氧配体轨道。这些材料（含NiO）可以归类为一类新材料“原子间中间价”（IAIV），由配置相互作用4f 0x 4f 1 L-1描述。
High resolution XANES spectra of insulating lanthanum and cerium 4f0and 4f1compounds have been measured. We demonstrate that final state effects like charge transfer satellites (configuration interactions in the final state) are quenched in XANES, and that the splitting of core excitations in LIII-and LI-XANES of Ce(SO4)2like in CeO2is due to configuration interaction in theinitialstate. We show that the ground state electronic structure of formally Ce4+compounds is given by mixing of multielectron configurations involving oxygen ligand orbitals. These materials (with NiO) can be classified in a new class of materials “inter-atomic intermediate valent” (IAIV) described by configuration interactions 4f0x 4f1L-1.