Interaction of Optically Excited Carriers with Intraicosahedral Phonons

Werheit, H.; Schmechel, Roland; Lorse, K.P.

doi:10.1006/jssc.1997.7329

Cited by 5 publications

(1 citation statement)

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“…We suppose that the Nd:YAG laser warms the sample thus inducing the fast relaxation of optically excited electrons. At room temperature, ambient light evokes a considerable photo-effect with a very long relaxation time, which evokes certain structural distortions [56]. Carbon atoms in β-rhombohedral boron preferably substitute for boron atoms in the polar sites of the icosahedra [57].…”

Section: β-Rhombohedral Boron Structure Groupmentioning

confidence: 99%

Raman effect in icosahedral boron-rich solids

Werheit¹,

Филипов

Kuhlmann

et al. 2010

Science and Technology of Advanced Materials

130

116

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We present Raman spectra of numerous icosahedral boron-rich solids having the structure of α-rhombohedral, β-rhombohedral, α-tetragonal, β-tetragonal, YB 66 , orthorhombic or amorphous boron. The spectra were newly measured and, in some cases, compared with reported data and discussed. We emphasize the importance of a high signal-to-noise ratio in the Raman spectra for detecting weak effects evoked by the modification of compounds, accommodation of interstitial atoms and other structural defects. Vibrations of the icosahedra, occurring in all the spectra, are interpreted using the description of modes in α-rhombohedral boron by Beckel et al. The Raman spectrum of boron carbide is largely clarified. Relative intra-and inter-icosahedral bonding forces are estimated for the different structural groups and for vanadium-doped β-rhombohedral boron. The validity of Badger's rule is demonstrated for the force constants of inter-icosahedral B-B bonds, whereas the agreement is less satisfactory for the intra-icosahedral B-B bonds.

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Section: β-Rhombohedral Boron Structure Groupmentioning

confidence: 99%