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자연과학대학
화학·나노과학전공
Journal papers
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Eu7Ga6Sb8: A Zintl phase with Ga-Ga bonds and polymeric gallium antimonide chains
Title
Eu7Ga6Sb8: A Zintl phase with Ga-Ga bonds and polymeric gallium antimonide chains
Authors
Park S.-M.
;
Kim S.-J.
;
Kanatzidis M.G.
Ewha Authors
김성진
SCOPUS Author ID
김성진
Issue Date
2004
Journal Title
Journal of Solid State Chemistry
ISSN
0022-4596
Citation
Journal of Solid State Chemistry vol. 177, no. 8, pp. 2867 - 2874
Indexed
SCI; SCIE; SCOPUS
Document Type
Article
Abstract
The Zintl phase Eu7Ga6Sb8 was obtained from a direct element combination reaction at 900°C. It crystallizes in the orthorhombic space group Pbca (No. 61) with a=15.6470(17)Å, b=17.2876(19)Å, c=17.9200(19)Å, and Z=8. In Eu7Ga 6Sb8, the anionic framework forms infinite chains of [Ga6Sb8]14- which are arranged side by side to make a sheet-like arrangement but without linking. The sheets of chains are separated by Eu2+ atoms and also within the sheet, Eu2+ atoms fill the spaces between two chains. The chain is made up of homoatomic tetramers (Ga4)6+ and dimers (Ga2)4+ connected by Sb atoms. The compound is a narrow band-gap semiconductor with Eg∼0.6eV and satisfies the classical Zintl concept. Extended Hückel band structure calculations confirm that the material is a semiconductor and suggest that the structure is stabilized by strong Ga-Ga covalent bonding interactions. Magnetic susceptibility measurements for Eu 7Ga6Sb8 show that the Eu atoms are divalent and the compound has an antiferromagnetic transition at 9K. © 2004 Elsevier Inc. All rights reserved.
DOI
10.1016/j.jssc.2004.04.025
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