Optical properties and electronic structure of the intermetallic phases NiAl, CoAl, and FeAl.
Optical properties and electronic structure of the intermetallic phases NiAl, CoAl, and FeAl.
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金属间相 NiAl、CoAl 和 FeAl 的光学性质和电子结构。
DOI：
10.1103/physrevb.50.17802
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Thomas
中科院分区：
文献类型：
--
作者：
Schlemper;Thomas
通过差示反射法和Kramers-Kronig分析，在1.2-5 eV的能量范围内，对于接近化学计量的各种组合物，确定了金属间化合物B2相NiAl、CoAl和FeAl的介电函数。实验吸收最大值与这些合金的能带结构相关。所有的跃迁都可以归属于能带结构。根据涉及费米能级的跃迁的Ekman规则，可以通过费米能级的移位来解释吸收最大值的移位，并且对于其他跃迁，可以通过在约0.01 eV/at% Al的范围内的能带结构能级的小变化来解释吸收最大值的移位。
The dielectric functions of the intermetallic B2 phases NiAl, CoAl, and FeAl have been determined by differential reflectometry and the Kramers-Kronig analysis in the energy range of 1.2–5 eV for various compositions near stoichiometry. The experimental absorption maxima are correlated to the band structure of these alloys taken from the literature. All transitions could be assigned to the band structure. The shift of absorption maxima could be explained by a shift of the Fermi level according to the Ekman rule for transitions involving the Fermi level, and for other transitions by small changes of the band-structure levels in the range of about 0.01 eV/at% Al.