A NEW INTERMETALLIC PHASE IN THE TERNARY-SYSTEM - LITHIUM-ZINC-GALLIUM, A HEXAGONAL-TYPE ARRANGEMENT OF EXTENDED ICOSAHEDRAL UNITS

Authors
TILLARDCHARBONNEL M CHAHINE A BELIN C
Citation
M. Tillardcharbonnel et al., A NEW INTERMETALLIC PHASE IN THE TERNARY-SYSTEM - LITHIUM-ZINC-GALLIUM, A HEXAGONAL-TYPE ARRANGEMENT OF EXTENDED ICOSAHEDRAL UNITS, Materials research bulletin, 28(12), 1993, pp. 1285-1294
Citations number
32
Categorie Soggetti
Material Science
Journal title
Materials research bulletin → ACNP
ISSN journal
00255408
Volume
28
Issue
12
Year of publication
1993
Pages
1285 - 1294
Database
ISI
SICI code
0025-5408(1993)28:12<1285:ANIPIT>2.0.ZU;2-B
Abstract
Incorporation of late transition elements in gallium intermetallic pha ses allows structural modelling of cluster frameworks. Li68Znl6Ga133 c rystallizes in the trigonal space group P $($) over bar$$ 31c (n degre es 163) with cell parameters (hexagonal axes) a = b = 13.657(3) and c = 23.435(5)Angstrom. The structure contains Samson polyhedra (extended icosahedral unit with 104 atoms) but contrary to the copper intermeta llic phase Li13Cu6Ga21 with body-centered cubic packing, these polyhed ra adopt a pillar stacking along the c-axis of the hexagonal cell. Zin c and gallium are not distinguished crystallographically. Coordination as well as atomic bonding and electronic requirements are discussed.