Journal
DIAMOND AND RELATED MATERIALS
Volume 25, Issue -, Pages 40-44Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2012.02.013
Keywords
Hexagonal diamond; Electron energy-loss spectroscopy; Dielectric properties; Band structure; Optical properties
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [19051002]
- Grants-in-Aid for Scientific Research [19051002] Funding Source: KAKEN
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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. (C) 2012 Elsevier B.V. All rights reserved.
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