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Related Experiment Videos

Homologous phases built by boron clusters and their vibrational properties.

F Zhang1, F Xu, A Leithe-Jasper

  • 1National Institute for Materials Science, Advanced Materials Laboratory, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.

Inorganic Chemistry
|January 5, 2002
PubMed
Summary

New rare earth boron-rich solids (REBC(N)) were discovered, exhibiting structures homologous to boron carbide (B(4)C). Their layered arrangements of boron icosahedra and octahedra influence unit cell dimensions and vibrational properties.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Boron carbide (B(4)C) is a well-known ceramic with a complex structure.
  • Rare earth elements offer unique properties for material design.

Purpose of the Study:

  • To discover and characterize new rare earth boron-rich solids.
  • To investigate the structural relationships between these new phases and B(4)C.
  • To analyze their vibrational properties.

Main Methods:

  • Single crystal and powder X-ray diffraction for structure determination.
  • Synthesis of monophase powders and single crystals.
  • Raman spectroscopy for vibrational mode analysis.

Main Results:

Related Experiment Videos

  • A series of new rare earth boron-rich solids in REBC(N) systems (RE: Y, Ho, Er, Tm, Lu) were identified.
  • These new phases exhibit structures homologous to B(4)C with trigonal symmetry.
  • Layered stacking of boron icosahedra and octahedra dictates unit cell parameters, particularly the c-axis length.
  • Raman spectra revealed characteristic vibrational modes for these homologous phases.

Conclusions:

  • The discovered REBC(N) compounds represent a new homologous series related to B(4)C.
  • Structural variations are linked to the stacking sequence of boron polyhedra.
  • Vibrational analysis provides insights into the bonding and structure of these novel materials.