Novel rare earth boron-rich solids

Journal Article · Fri Jun 01 00:00:00 EDT 2001 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.2001.9147· OSTI ID:782915

Zhang, Fuxiang; Leithe-Jasper, Andreas; Xu, Jun; Mori, Takao; Okada, Shigeru

A new series of boron-rich solids ReB{sub 22}C{sub 2}N (Re: Y, Ho, Er, Tm, Lu) was synthesized by traditional solid-state reaction. The crystal structure of the representative compound YB{sub 22}C{sub 2}N was solved by direct method from powder X-ray diffraction (XRD) data and transmission electron microscope (TEM) analysis. The unit cell of the new structure is rhombohedral with space group R-3m (No. 166), lattice constant a = b = 5.623(0) {angstrom} and c = 44.785(3) {angstrom} with six formula units in one unit cell. The atoms of boron in the solids, like most of the boron-rich solids, exist with icosahedral and octahedral clusters, and the whole crystal shows a layered structure. The interconnected nine layers of icosahedron and three layers of octahedron in a unit cell build the whole framework of the new phase and rare earth metal atoms reside in voids of the octahedron layers. The neighboring icosahedral layers link through C-B-C chains besides the direct bonding of B-B. Both experimental and structural analysis indicated that the nitrogen atoms in the new phase can be replaced with carbon.

• Research Organization: National Institute for Research in Inorganic Materials, Tsukaba, Ibaraki (JP); Faculty of Engineering, Kokushikan University, Setagaya, Tokyo (JP)
• Sponsoring Organization: None (US)
• OSTI ID: 782915
• Journal Information: Journal of Solid State Chemistry, Vol. 159, Issue 1; Other Information: PBD: 1 Jun 2001; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ATOMS
BONDING
BORON
CARBON
CRYSTAL STRUCTURE
ELECTRON MICROSCOPES
NITROGEN
RARE EARTHS
SPACE GROUPS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
HOLMIUM COMPOUNDS
ERBIUM COMPOUNDS
THULIUM COMPOUNDS
LUTETIUM COMPOUNDS
BORON COMPOUNDS
CARBIDES
NITRIDES
LATTICE PARAMETERS
TRANSMISSION ELECTRON MICROSCOPY
SYNTHESIS