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Title: Raman scattering from superhard rhenium diboride under high pressure

Lattice vibrational properties of superhard rhenium diboride (ReB{sub 2}) were examined up to 8 GPa in a diamond anvil cell using Raman spectroscopy techniques. Linear pressure coefficients and mode Grüneisen parameters are obtained. Good agreement is found between the experimental and theoretical calculated Grüneisen parameters. Examination of the calculated mode Grüneisen parameters reveals that both B-B and Re-B covalent bonds play a dominant role in supporting the applied load under pressure. A comparison of vibrations parallel and perpendicular to the c-axis indicates that bonds along the c-axis tend to take greater loads. Our results agree with observations of elastic lattice anisotropy obtained from both in situ X-ray diffraction measurements and ultrasonic resonance spectra.
Authors:
 [1] ;  [2] ;  [3] ; ;  [1] ;  [4] ;  [5] ;  [3] ;  [5]
  1. Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095 (United States)
  2. Geowissenschaften, Goethe-Universität, Altenhöferallee 1, D-60438 Frankfurt a. M. (Germany)
  3. Department of Earth and Space Sciences, University of California, Los Angeles, California 90095 (United States)
  4. (United States)
  5. (CNSI), University of California, Los Angeles, California 90095 (United States)
Publication Date:
OSTI Identifier:
22257132
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHEMICAL BONDS; DIAMONDS; PRESSURE COEFFICIENT; PRESSURE RANGE GIGA PA; RAMAN SPECTROSCOPY; RHENIUM; X-RAY DIFFRACTION