High energy-resolution electron energy-loss spectroscopy analysis of dielectric property and electronic structure of hexagonal diamond

Yohei Sato, Masami Terauchi, Wataru Inami, Akira Yoshiasa

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

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 languageEnglish
Pages (from-to)40-44
Number of pages5
JournalDiamond and Related Materials
Volume25
DOIs
Publication statusPublished - 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

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