New quaternary carbon and nitrogen stabilized polyborides: REB15.5CN (RE: Sc, Y, Ho, Er, Tm, Lu), crystal structure and compound formation
作者： A Leithe-Jasper , T Tanaka , L Bourgeois , T Mori , Y Michiue
DOI: 10.1016/J.JSSC.2003.02.003
关键词:
摘要: A new family of quaternary carbon and nitrogen containing Rare Earth (RE: Sc, Y, Ho, Er, Tm Lu) borides: REB 15.5 CN, has been synthesized structurally characterized by powder X-ray diffraction data. They are all isotypic with Sc 1-x B CN whose structure was solved based on single-crystal data HRTEM investigations. The refinement converged at a R(F 2 ) value 0.044 for 364 reflections. type is composed three-dimensional network interconnected slabs boron (B 12 ico icosahedra 6 oct octahedra. linear [CBC] chain tightly bridges icosahedra. partially occupies voids in the sheets It crystallizes trigonal space group P 3 m1, Z = 2. Lattice parameters (nm) as follows: RE: a,b 0.5568(4), c 1.0756(2): 0.55919(6), 1.0873(2); 0.55883(7), 1.0878(6); 0.55889(5), 1.0880(6); Tm, 0.5580(1), 1.0850(6); Lu, 0.55771(9), 1.0839(4). Magnetic characterization ErB 17 C 1.3 N 0.6 performed.
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