Two extended metal chain compounds, Y/sub 4/I/sub 5/C and Y/sub 6/I/sub 7/C/sub 2/. Synthesis, structure, properties, and bonding
The title phases are obtained in high yield from the reactions of stoichiometric quantities of Y, YI/sub 3/, and graphite at 850-950/degree/C in welded Nb containers. The crystal structures of the two phases determined by standard x-ray diffraction means are related to those published for Er/sub 4/I/sub 5/ and Er/sub 6/I/sub 7/ (C2/m, Z = 2, /alpha/ = 18.479 (6) and 21.557 (8) /angstrom/, b = 3.947 (1) and 3.909 (1) /angstrom/, c = 8.472 (3) and 12.374 (6) /angstrom/, /beta/ = 103.22 (4) and 123.55 (3)/degree/, R/R/sub w/ = 4.6/5.4 and 3.2/3.7% for Y/sub 4/I/sub 5/C and Y/sub 6/I/sub 7/C/sub 2/, respectively). The two compounds contain infinite single and double chains of carbon-centered yttrium octahedra, respectively, condensed by edge-sharing and sheathed by edge-bridging iodine atoms together with square-planar iodine atoms that bridge between chains. Extended Hueckel MO band calculations were carried out for the empty and the carbon-centered compounds in both structures. Metal-based bands near E/sub F/ in the empty chains exhibit characteristic strong interactions with carbon valence orbitals that generate low-lying valence bands. E/sub F/ in both cases falls within a broad, metal-based conduction band. Resistivity and magnetic susceptibility measurements on Y/sub 6/I/sub 7/C/sub 2/ support the predicted metallic character. 26 refs., 11 figs., 3 tabs.
- Research Organization:
- Iowa State Univ., Ames (USA)
- OSTI ID:
- 5828463
- Journal Information:
- Inorg. Chem.; (United States), Vol. 27:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON COMPOUNDS
CHEMICAL BONDS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
MAGNETIC SUSCEPTIBILITY
SYNTHESIS
IODINE COMPOUNDS
YTTRIUM COMPOUNDS
EXPERIMENTAL DATA
DATA
ELECTRICAL PROPERTIES
HALOGEN COMPOUNDS
INFORMATION
MAGNETIC PROPERTIES
NUMERICAL DATA
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
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& Refractories- Structure & Phase Studies
360204 - Ceramics
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& Refractories- Physical Properties