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Evolution of structural and optical-absorption properties in V_xFe_(3-x)O_4

机译：V_xFe_（3-x）O_4中结构和光吸收特性的演变

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摘要

The evolution of structural and optical properties by V substitution in magnetite (Fe_3O_4) was investigated. V_xFe_(3-x)O_4 (x ≤ 1.0) compounds maintain a cubic structure of magnetite with V ions mainly having a valence of +3 and occupying octahedral sites, revealed by using X-ray diffraction, X-ray photoelectron spectroscopy, and Moessbauer spectroscopy. Optical constants of V_xFe_(3-x)O_4 thin films measured by spectroscopic ellipsometry in the 1-8 eV range vary significantly with V composition. The octahedral Fe ions are interpreted as being responsible for the observed reduction in the strength of the major absorption structures of Fe_3O_4 by V doping. Thus, a number of charge-transfer transitions involving octahedral (e_g and t_(2g)) and tetrahedral (t_2 and e) Fe d states are identified as contributing to the optical absorption spectrum of Fe_3O_4 and their energy differences are estimated.
机译：研究了在磁铁矿（Fe_3O_4）中V取代引起的结构和光学性质的演变。通过X射线衍射，X射线光电子能谱和Moessbauer揭示，V_xFe_（3-x）O_4（x≤1.0）的化合物保持具有V离子的磁铁矿的立方结构，主要具有+3价和占据八面体位置。光谱学。通过光谱椭圆偏振法在1-8 eV范围内测量的V_xFe_（3-x）O_4薄膜的光学常数随V组成而显着变化。八面体Fe离子被解释为是由于V掺杂导致观察到的Fe_3O_4主要吸收结构强度降低的原因。因此，鉴定出涉及八面体（e_g和t_（2g））和四面体（t_2和e）Fe d态的许多电荷转移跃迁有助于Fe_3O_4的光吸收谱，并估计了它们的能量差。

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