Abstract
Electron energy-loss spectroscopy measurements of a hexagonal diamond (h-DIA) were performed using a transmission electron microscope equipped with a monochromator. From the measurements, the dielectric function of h-DIA was derived using Kramers-Kronig analysis (KKA) for the first time. The results of KKA showed that the band gap energy of h-DIA was 4.2 eV, which is 1.3 eV smaller than that of a cubic diamond (c-DIA). The peak energies that appeared in the imaginary part of the dielectric function were assigned to the interband transition energies predicted by theoretical calculations. The K-shell excitation spectrum of h-DIA, which was apparently different from that of c-DIA, also showed good agreement with the reported theoretical prediction.
Original language | English |
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Pages (from-to) | 40-44 |
Number of pages | 5 |
Journal | Diamond and Related Materials |
Volume | 25 |
DOIs | |
Publication status | Published - 2012 May 1 |
Keywords
- Band structure
- Dielectric properties
- Electron energy-loss spectroscopy
- Hexagonal diamond
- Optical properties
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Chemistry(all)
- Mechanical Engineering
- Materials Chemistry
- Electrical and Electronic Engineering