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Samples of YB 2 C 2  and GdB 2 C 2  were synthesized by arc-melting and subsequent annealing of the products. Single crystals of the title compounds were examined with single-crystal X-ray methods. Five different tetragonal unit cell settings from the literature (obtained on the basis of symmetry considerations) were used for the refinement of the crystal structure of YB 2 C 2 , but a converging refinement was only achieved for the structural model in the space group P4=mbm (no. 127, Z = 2) with a = 533:27(3) and c = 354:58(3) pm, without obvious inconsistencies. Nevertheless, the results for the five different unit cell settings are compared and discussed. A refinement of the crystal structure of the isotypic compound GdB 2 C 2  was also performed with the lattice parameters a = 537:46(6) and c = 364:98(11) pm. Neither EuB 2 C 2  nor YbB 2 C 2  were obtained by melting coldpressed pellets with the nominal composition RE 1.5 B 2 C 2  in an arc-furnace or an induction furnace, or by just heating the pellets in sealed Ta ampoules

Different Structural Models of YB2C2 and GdB2C2 on the Basis of Single-Crystal X-Ray Data