X-ray diffraction patterns of LuNi2B2C and YNi2B2C

Reference X-ray diffraction patterns for the quarternary intermetallic superconductor phases of compositions LuNi 2 B 2 C and YNi 2 B 2 C are reported. Both materials were synthesized by the arc-melting technique. The patterns of these metallic phases exhibit preferred orientation in an ordinarily pressed sample, which was minimized through special specimen preparation. The observed intensities and the calculated values for both phases agree reasonably well with each other. Both compounds were refined in the space group I 4/ mmm , with a =3.4647(1) Å and c =10.6330(4) Å for LuNi 2 B 2 C and a =3.5271(1) Å, c =10.5361(7) Å for YNi 2 B 2 C.