La{sub 3}Ru{sub 8}B{sub 6} and Y{sub 3}Os{sub 8}B{sub 6}, new members of a homologous series R(A){sub n}M{sub 3n-1}B{sub 2n}

Journal Article · Mon Oct 15 00:00:00 EDT 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.02.019· OSTI ID:21049505

Salamakha, L P ^[1]; Noel, H ^[2]; Roisnel, T ^[3]; Goncalves, A P ^[1]

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1. Departamento de Quimica, Instituto Tecnologico e Nuclear/CFMC-UL, Estrada Nacional 10, P-2686-953 Sacavem Codex (Portugal)
2. Laboratoire de Chimie du Solide et Materiaux, UMR CNRS 6226, Universite de Rennes 1 (France)
3. Centre de Diffractometrie X, UMR 6226, CNRS-Universite de Rennes 1 (France)

Two new compounds, La{sub 3}Ru{sub 8}B{sub 6} and Y{sub 3}Os{sub 8}B{sub 6}, were synthesized by arc melting the elements. Their structural characterization was carried out at room temperature on as-cast samples by using X-ray diffractometry. According to X-ray single-crystal diffraction results these borides crystallize in Fmmm space group (no. 69), Z=4, a=5.5607(1) A, b=9.8035(3) A, c=17.5524(4) A, {rho}=8.956 Mg/m{sup 3}, {mu}=25.23 mm{sup -1} for La{sub 3}Ru{sub 8}B{sub 6} and a=5.4792(2) A, b=9.5139(4) A, c=17.6972(8) A, {rho}=13.343 Mg/m{sup 3}, {mu}=128.23 mm{sup -1} for Y{sub 3}Os{sub 8}B{sub 6}. The crystal structure of La{sub 3}Ru{sub 8}B{sub 6} was confirmed from Rietveld refinement of X-ray powder diffraction data. Both La{sub 3}Ru{sub 8}B{sub 6} and Y{sub 3}Os{sub 8}B{sub 6} compounds are isotypic with the Ca{sub 3}Rh{sub 8}B{sub 6} compound and their structures are built up from CeCo{sub 3}B{sub 2}-type and CeAl{sub 2}Ga{sub 2}-type structural fragments taken in ratio 2:1. They are the members of structural series R(A){sub n}M{sub 3n-1}B{sub 2n} with n=3 (R is the rare earth metal, A the alkaline earth metal, and M the transition metal). Structural and atomic parameters were also obtained for La{sub 0.94}Ru{sub 3}B{sub 2} compound from Rietveld refinement (CeCo{sub 3}B{sub 2}-type structure, P6/mmm space group (no. 191), a=5.5835(9) A, c=3.0278(6) A). - Graphical abstract: Two new compounds, La{sub 3}Ru{sub 8}B{sub 6} and Y{sub 3}Os{sub 8}B{sub 6}, were synthesized by arc melting the elements. From room temperature X-ray single-crystal and powder diffraction, both compounds were found to be isotypic with Ca{sub 3}Rh{sub 8}B{sub 6} compound (Fmmm space group (no. 69), Z=4) and their structures are built up from CeCo{sub 3}B{sub 2}-type and CeAl{sub 2}Ga{sub 2}-type structural fragments taken in ratio 2:1. They are the members of structural series R(A){sub n}M{sub 3n-1}B{sub 2n} with n=3 (R is the rare earth metal, A the alkaline earth metal, and M the transition metal)

• OSTI ID: 21049505
• Journal Information: Journal of Solid State Chemistry, Vol. 180, Issue 10; Other Information: DOI: 10.1016/j.jssc.2007.02.019; PII: S0022-4596(07)00092-8; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HEXAGONAL LATTICES
LANTHANUM BORIDES
MELTING
ORTHORHOMBIC LATTICES
OSMIUM BORIDES
RUTHENIUM BORIDES
SPACE GROUPS
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION
YTTRIUM BORIDES