Lanthanides & Actinides: Lanthanide Borides


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Lanthanide Borides

A variety of binary borides exist e.g. YB₂, YB₄, YB₆, YB₁₂, YB₆₆
Most important are LnB₆
- contain B₆ octahedral clusters
- isomorphous with CaB₆
- black, metallic conductivity
  (c.f. CaB₆ white, insulator)
- formulated as Ln³⁺(B₆^2-)(e^-)
  except EuB₆, YbB₆ which are Ln²⁺(B₆^2-)

MT₄B₄compounds
- M = Sc, Y, Ln, Th, U
- T = Ru, Os, Co, Rh, Ir
- of current interest for their superconductivity
  e.g. CeCo₄B₄ structure
  YRh₄B₄ T_c = 11.3 K
  ErRh₄B₄ T_c = 8.7 K
  also ferromagnetic (T_Curie = 0.93 K)

Bibliography [textbook & online resources]

Source: Dr. S.J. Heyes; University of Oxford

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