TY - JOUR
T1 - Eu7Ga6Sb8
T2 - A Zintl phase with Ga-Ga bonds and polymeric gallium antimonide chains
AU - Park, Seon Mi
AU - Kim, Sung Jin
AU - Kanatzidis, Mercouri G.
N1 - Funding Information:
Financial supports from Korea Research Foundation (KRF-2003-042-C00065) and the Center for Fundamental Materials Research are gratefully acknowledged. Financial support from the Department of Energy (Grant # DE-FG02-99ER45793 to MGK) is gratefully acknowledged. This work made use of the SEM/EDS facilities of the Center of Advanced Microscopy at Michigan State University.
PY - 2004/8
Y1 - 2004/8
N2 - 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.
AB - 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.
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U2 - 10.1016/j.jssc.2004.04.025
DO - 10.1016/j.jssc.2004.04.025
M3 - Article
AN - SCOPUS:3342875693
SN - 0022-4596
VL - 177
SP - 2867
EP - 2874
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 8
ER -