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Optical Anisotropy of β‐Rhombohedral Boron from 0.4 to 16 μm
Author(s) -
Werheit H.,
Hausen A.,
Binnenbruck H.
Publication year - 1972
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220510110
Subject(s) - anisotropy , boron , impurity , condensed matter physics , trigonal crystal system , crystallite , absorption edge , optical anisotropy , materials science , lattice (music) , photon energy , reflectivity , absorption (acoustics) , dichroism , range (aeronautics) , lattice vibration , band gap , photon , crystallography , chemistry , crystal structure , optics , physics , phonon , organic chemistry , acoustics , composite material
In the intrinsic range the anisotropy of the reflectivity amounts to about 2% while the dichroism is very small at high photon energies and can only be measured when α ⪅ 2 × × 10 3 cm −1 . Especially distinct is the anisotropy of the lattice vibrations. Similar to polycrystalline boron two indirect interband transitions occur; the energy gaps are 1.561 and 1.39 eV with E ∥ c and 1.541 and 1.34 eV with E ⟂ c. The edge tail is dominated by an absorption band, which is possibly caused by C or Si impurities.