Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 179, Issue 9, Pages 2761-2767Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2005.11.034
Keywords
ZrB12; (LuB12)-B-nat; (LuB12)-B-11; Raman spectra; structural imperfections; vacancies; isotope effects; metal atom displacements
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We have measured Raman spectra of high-quality (ZrB12)-B-nat, (LuB12)-B-nat and (LuB12)-B-11 single crystals with high resolution, and the observed strong peaks are attributed to specific vibration modes. Besides, there are a number of additional Raman peaks in spectral ranges, where only Raman-inactive vibrations of the atomic arrangement are expected. Accordingly, it is assumed, that the investigated crystals contain intrinsic structural imperfections or distortions in sufficient concentration and efficiency to initiate the observed breaking of phonon selection rules. We suppose boron vacancies, boron isotope effects and displacements of the metal atoms to be reasons for such imperfections. (c) 2005 Elsevier Inc. All rights reserved.
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