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IR-Active Phonons and Structure Elements of Isotope-Enriched Boron Carbide

✍ Scribed by H. Werheit; T. Au; R. Schmechel; S.O. Shalamberidze; G.I. Kalandadze; A.M. Eristavi

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 194 KB
Volume: 154
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.8815

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✦ Synopsis

The IR phonon spectra of 10 B, 11 B, and 13 C isotope-enriched boron carbide with the compositions B 4.3 C, B 6.5 C, and B 10 C are presented. Speci5c phonons are attributed to the stretching and the bending mode of a small concentration of CCC chains, whose occurrence seems to depend on the speci5c preparation conditions. Based on the assumption that the electron de5ciency is compensated by structural defects, the concentrations of CBC, CBB, CCC, and BᮀB arrangements are determined for the whole homogeneity range. Then the concentrations of B 12 and B 11 C icosahedra result from the compound stoichiometry. The concentration of BᮀB arrangements, calculated this way, excellently agrees with the concentration of B(3) vacancies obtained by neutron scattering.

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✍ R. Schmechel; H. Werheit; K. Robberding; T. Lundström; H. Bolmgren 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 255 KB

The IR spectra of boron carbide containing up to about 1.5 at.% aluminum atoms are determined between 80 and 5000 cm ؊1 for temperatures between 70 and 450 K. While the essential features of the boron carbide phonon spectrum remain largely unchanged, there are several new low energy absorption bands