Synthesis, structure and properties of Li 2Rh 3B 2

Abstract

Li 2Rh 3B 2 has been synthesized at 1000 °C from a stoichiometric mix of rhodium and boron and an excess of lithium. Li 2Rh 3B 2 crystallizes in the orthorhombic space group Pbam (no. 55, Z=2) with room temperature lattice constants a=5.7712(1) Å, b=9.4377(2) Å, c=2.8301(1) Å and cell volume 154.149(6) Å 3. The structure was solved from single crystal X-ray diffraction yielding the final R indices (all data) R1=2.8% and w R2=4.7%. The structure is a distortion of the CeCo 3B 2 structure type, containing a network of Rh 6B trigonal prisms and short Li–Li contacts of 2.28(2) Å. Li 2Rh 3B 2 is a diamagnetic metal with a room temperature resistivity of 19 μΩ cm, as determined by magnetic susceptibility and single crystal transport measurements. The measured diamagnetism and electronic structure calculations show that Li 2Rh 3B 2 contains rhodium in a d 10 configuration.