Dielectric Properties of ZrC by Electron Energy Loss Spectroscopy
Dielectric Properties of ZrC by Electron Energy Loss Spectroscopy
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通过电子能量损失谱测定 ZrC 的介电性能
DOI：
10.1017/s1431927600031834
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发表时间：
2001
影响因子：
2.8
通讯作者：
F. Paraguay
中科院分区：
文献类型：
--
作者：
F. Espinosa‒Magaña;A. Duarte;R. Martínez;F. Paraguay
碳化锆属于NaCl结构的难熔化合物，具有较高的化学惰性和熔点，这些特性使得这些材料作为硬涂层发挥了突出的作用，而这些性能与其电子结构密切相关。ZrC的电子构型为（Xe） 5d2 6s2，其中1个s电子能被提升到d轨道，形成4个等效的sd3杂化轨道，有利于维持共价键，但其离子性质约占30%。近二十年来，利用电子能量损失谱（EELS）研究过渡金属碳化物和氮化物的光学性质得到了一定的重视，其中以TiC和TiN报道最多。本文利用CM-200型透射电镜（TEM）上的Gatan平行探测电子能谱仪（766型）测定了商品粉末ZrC的光学常数。
Zirconium carbide belongs to the group of refractory compounds having NaCl structure with high chemical inertness and melting point, characteristics that have made these materials to play a prominent role as hard coatings and these properties are closely related to their electronic structure. The electronic configuration of ZrC is: (Xe) 5d2 6s2, one s electron being able to be promoted to a d orbital forming four equivalent sd3 hybrid orbitals, favoring covalent bonds maintaining, however, a percentage in ionic character of about 30%. Some attention has been paid in the last two decades in studying the optical properties of transition metal carbides and nitrides by electron energy loss spectroscopy (EELS), being TiC and TiN the most extensively reported. In this work the optical constants of commercial powder ZrC were obtained using a Gatan Parallel Detection Electron spectrometer (model 766) attached to the CM-200 transmission electron microscope (TEM).