Stereophotographs of diamond and graphite

Abstract

The direct imaging of atomic arrangement is essential for investigation of materials science. The rotation of forward focusing peaks in photoelectron intensity angular distribution (PIAD) pattern excited by circularly polarized light with the opposite helicities is found to be the same as the parallax in stereo view. Taking advantage of this phenomenon of PIAD circular dichroism, the three-dimensional atomic arrangement visualization of diamond and graphite crystal was realized. Taking a stereo picture around carbon atom, which has been thought difficult due to a small angular momentum and scattering cross section of photoelectron, proved that this method is applicable to various materials consisting of light elements. Furthermore, the local boron dopant site was concluded to be mainly substitutional one from the comparison of B 1s and C 1s PIAD patterns. r

Asymmetric Phosphorus Incorporation in Homoepitaxial P-Doped (111) Diamond Revealed by Photoelectron Holography

“…Recently, PEH using third-generation synchrotron light has facilitated the observation of the local structure of dopant atoms in impurity-doped semiconductors 24,25 . For the preferential incorporation of dopant atoms, there is a pioneering study on the local structure of boron-doped sites in heavily B-doped diamond 26 ; however, it was a chemical-site-integrated study and the reconstruction of atomic images was not performed.…”

A microstructural study of superconductive nanocrystalline diamond

“…In all cases, there has been some concern about boron incorporation in sites different from the ideal isolated substitutionnal site. However, apart from some experimental studies of boron pairing 13, clustering 14, boron passivation by hydrogen 15, or interstitial incorporation 16 effects, the influence of the crystallinity of the diamond lattice on the superconductive properties has not been yet investigated in full detail, in particular for the micro‐ or nanocrystalline material. The aim of the present ongoing study is thus to contribute to discuss the superconductivity in polycrystalline diamond on the basis of a preliminary microstructural study of boron‐doped CVD NCD using transmission electron microscopy (TEM) techniques.…”