Crystal Growth, Structures, and Properties of the Complex Borides, LaOs2Al2B and La2Os2AlB2
| Autor: | Jino Im, Daniel E. Bugaris, Fei Han, Mercouri G. Kanatzidis, Duck Young Chung, Arthur J. Freeman |
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| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_element
Crystal growth Crystal structure Crystal structure of boron-rich metal borides Inorganic Chemistry Metal Tetragonal crystal system Crystallography chemistry visual_art visual_art.visual_art_medium Physical and Theoretical Chemistry Boron Electronic band structure Monoclinic crystal system |
| Zdroj: | Inorganic Chemistry. 54:8049-8057 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/acs.inorgchem.5b01275 |
| Popis: | Single crystals of two novel quaternary metal borides, LaOs2Al2B and La2Os2AlB2, have been grown from La/Ni eutectic fluxes. LaOs2Al2B crystallizes in tetragonal space group P4/mmm with the CeCr2Si2C-type structure, and lattice parameters a = 4.2075(6) Å and c = 5.634(1) Å. La2Os2AlB2 exhibits a new crystal structure in monoclinic space group C2/c with lattice parameters a = 16.629(3) Å, b = 6.048(1) Å, c = 10.393(2) Å, and β = 113.96(3)°. Both structures are three-dimensional frameworks with unusual coordination (for solid-state compounds) of the boron atoms by transition metal atoms. The boron atom is square planar in LaOs2Al2B, whereas it exhibits linear and T-shaped geometries in La2Os2AlB2. Electrical resistivity measurements reveal poor metal behavior (ρ300 K ∼ 900 μΩ cm) for La2Os2AlB2, consistent with the electronic band structure calculations, which also predict a metallic character for LaOs2Al2B. |
| Databáze: | OpenAIRE |
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