High-Pressure Synthesis of SmB2 and GdB12

  • J. F. Cannon
  • D. M. Cannon
  • H. T. Hall


Borides with a composition LnB2 and LnB12 have been reported [1,2] for the smaller members of the lanthanide series. Diborides have been prepared [3–10] for Ln = Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc and dodecaborides are known [5,6,11–16] for Ln = Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, Sc. The diborides are isomorphous, with an AlB2-type (C32) structure. This structure is hexagonal (P6/mmm) and consists of alternating layers of metal atoms and boron atoms. The metal atoms form close-packed (36) layers and the boron atoms, hexagonal (63) layers. The layers are arranged such that boron atoms are positioned over the faces of the triangles formed by the metal atoms. The dodecaborides (except SCB12) each assume a UB12-type(D2f) structure. This structure is cubic (Fm3m) with metal atoms at fcc positions and each metal atom surrounded by a B24 cubo-octahedron. The tetragonal structure of ScB12 is described by Matkovich, et al. [16].


Metal Atom Boron Atom Lanthanide Atom Lanthanide Series Lawrence Radiation Laboratory 
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Copyright information

© Springer Science+Business Media New York 1979

Authors and Affiliations

  • J. F. Cannon
    • 1
  • D. M. Cannon
    • 1
  • H. T. Hall
    • 1
  1. 1.Brigham Young UniversityProvoUSA

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