Crystal Growth, Structures, and Properties of the Complex Borides, LaOs2Al2B and La2Os2AlB2

Daniel E. Bugaris, Fei Han, Jino Im, Duck Young Chung, Arthur J Freeman, Mercouri G Kanatzidis

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Abstract

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. (Figure Presented)

Original languageEnglish
Pages (from-to)8049-8057
Number of pages9
JournalInorganic Chemistry
Volume54
Issue number16
DOIs
Publication statusPublished - Aug 17 2015

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Boron Compounds
borides
Crystallization
crystal growth
Atoms
Lattice constants
lattice parameters
boron
Metals
atoms
Boron
eutectics
Band structure
metals
Eutectics
Transition metals
Crystal structure
transition metals
Single crystals
Fluxes

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Crystal Growth, Structures, and Properties of the Complex Borides, LaOs2Al2B and La2Os2AlB2. / Bugaris, Daniel E.; Han, Fei; Im, Jino; Chung, Duck Young; Freeman, Arthur J; Kanatzidis, Mercouri G.

In: Inorganic Chemistry, Vol. 54, No. 16, 17.08.2015, p. 8049-8057.

Research output: Contribution to journalArticle

Bugaris, Daniel E. ; Han, Fei ; Im, Jino ; Chung, Duck Young ; Freeman, Arthur J ; Kanatzidis, Mercouri G. / Crystal Growth, Structures, and Properties of the Complex Borides, LaOs2Al2B and La2Os2AlB2. In: Inorganic Chemistry. 2015 ; Vol. 54, No. 16. pp. 8049-8057.
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abstract = "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) {\AA} and c = 5.634(1) {\AA}. La2Os2AlB2 exhibits a new crystal structure in monoclinic space group C2/c with lattice parameters a = 16.629(3) {\AA}, b = 6.048(1) {\AA}, c = 10.393(2) {\AA}, 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. (Figure Presented)",
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AB - 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. (Figure Presented)

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