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New quaternary carbon and nitrogen stabilized polyborides: REB15.5CN (RE: Sc, Y, Ho, Er, Tm, Lu), crystal structure and compound formation

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Title: New quaternary carbon and nitrogen stabilized polyborides: REB15.5CN (RE: Sc, Y, Ho, Er, Tm, Lu), crystal structure and compound formation
Authors: Leithe-Jasper, A., Tanaka, T. tanaka.takaho@nims.go.jp, Bourgeois, L., Mori, T.1, Michiue, Y.1
Source: Journal of Solid State Chemistry. Feb2004, Vol. 177 Issue 2, p431. 8p.
Subjects: Carbon, Nitrogen, Borides, X-ray diffraction
Abstract: A new family of quaternary carbon and nitrogen containing Rare Earth (RE: Sc, Y, Ho, Er, Tm and Lu) borides: REB15.5CN, has been synthesized and structurally characterized by powder X-ray diffraction data. They are all isotypic with Sc1−xB15.5CN whose structure was solved based on single-crystal X-ray data and HRTEM investigations. The structure refinement converged at a R(F2) value of 0.044 for 364 reflections. The new structure type of Sc1−xB15.5CN is composed of a three-dimensional network based on interconnected slabs of boron (B12)ico icosahedra and (B6)oct octahedra. A linear [CBC] chain and nitrogen tightly bridges icosahedra. Sc partially occupies voids in the sheets of boron octahedra. It crystallizes with the trigonal space group P3m1, with Z=2. Lattice parameters (nm) are as follows: for RE: Sc, a,b=0.5568(4), c=1.0756(2); Y, a,b=0.55919(6), c=1.0873(2); Ho, a,b=0.55883(7), c=1.0878(6); Er, a,b=0.55889(5), c=1.0880(6); Tm, a,b=0.5580(1), c=1.0850(6); Lu, a,b=0.55771(9), c=1.0839(4). Magnetic characterization of ErB17C1.3N0.6 has been performed. [Copyright &y& Elsevier]
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Abstract:A new family of quaternary carbon and nitrogen containing Rare Earth (<f>RE</f>: Sc, Y, Ho, Er, Tm and Lu) borides: <f>REB15.5CN</f>, has been synthesized and structurally characterized by powder X-ray diffraction data. They are all isotypic with Sc1−xB15.5CN whose structure was solved based on single-crystal X-ray data and HRTEM investigations. The structure refinement converged at a <f>R(F2)</f> value of 0.044 for 364 reflections. The new structure type of Sc1−xB15.5CN is composed of a three-dimensional network based on interconnected slabs of boron (B12)ico icosahedra and (B6)oct octahedra. A linear [CBC] chain and nitrogen tightly bridges icosahedra. Sc partially occupies voids in the sheets of boron octahedra. It crystallizes with the trigonal space group P3m1, with <f>Z=2</f>. Lattice parameters (nm) are as follows: for <f>RE</f>: Sc, <f>a,b=0.5568</f>(4), <f>c=1.0756</f>(2); Y, <f>a,b=0.55919</f>(6), <f>c=1.0873</f>(2); Ho, <f>a,b=0.55883</f>(7), <f>c=1.0878</f>(6); Er, <f>a,b=0.55889</f>(5), <f>c=1.0880</f>(6); Tm, <f>a,b=0.5580</f>(1), <f>c=1.0850</f>(6); Lu, <f>a,b=0.55771</f>(9), <f>c=1.0839</f>(4). Magnetic characterization of ErB17C1.3N0.6 has been performed. [Copyright &y& Elsevier]
ISSN:00224596
DOI:10.1016/j.jssc.2003.02.003