Abstract
The Zintl phase Eu{sub 7}Ga{sub 6}Sb{sub 8} was obtained from a direct element combination reaction at 900 deg. C. It crystallizes in the orthorhombic space group Pbca (No. 61) with a=15.6470(17) A, b=17.2876(19) A, c=17.9200(19) A, and Z=8. In Eu{sub 7}Ga{sub 6}Sb{sub 8}, the anionic framework forms infinite chains of [Ga{sub 6}Sb{sub 8}]{sup 14-} which are arranged side by side to make a sheet-like arrangement but without linking. The sheets of chains are separated by Eu{sup 2+} atoms and also within the sheet, Eu{sup 2+} atoms fill the spaces between two chains. The chain is made up of homoatomic tetramers (Ga{sub 4}){sup 6+} and dimers (Ga{sub 2}){sup 4+} connected by Sb atoms. The compound is a narrow band-gap semiconductor with E{sub g}{approx}0.6 eV and satisfies the classical Zintl concept. Extended Hueckel 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{sub 7}Ga{sub 6}Sb{sub 8} show that the Eu atoms are divalent and the compound has an antiferromagnetic transition at 9 K.
Citation Formats
Park, S -M, Kim, S -J, and Kanatzidis, M G.
Eu{sub 7}Ga{sub 6}Sb{sub 8}: A Zintl phase with Ga-Ga bonds and polymeric gallium antimonide chains.
United States: N. p.,
2004.
Web.
doi:10.1016/j.jssc.2004.04.025.
Park, S -M, Kim, S -J, & Kanatzidis, M G.
Eu{sub 7}Ga{sub 6}Sb{sub 8}: A Zintl phase with Ga-Ga bonds and polymeric gallium antimonide chains.
United States.
https://doi.org/10.1016/j.jssc.2004.04.025
Park, S -M, Kim, S -J, and Kanatzidis, M G.
2004.
"Eu{sub 7}Ga{sub 6}Sb{sub 8}: A Zintl phase with Ga-Ga bonds and polymeric gallium antimonide chains."
United States.
https://doi.org/10.1016/j.jssc.2004.04.025.
@misc{etde_20561647,
title = {Eu{sub 7}Ga{sub 6}Sb{sub 8}: A Zintl phase with Ga-Ga bonds and polymeric gallium antimonide chains}
author = {Park, S -M, Kim, S -J, and Kanatzidis, M G}
abstractNote = {The Zintl phase Eu{sub 7}Ga{sub 6}Sb{sub 8} was obtained from a direct element combination reaction at 900 deg. C. It crystallizes in the orthorhombic space group Pbca (No. 61) with a=15.6470(17) A, b=17.2876(19) A, c=17.9200(19) A, and Z=8. In Eu{sub 7}Ga{sub 6}Sb{sub 8}, the anionic framework forms infinite chains of [Ga{sub 6}Sb{sub 8}]{sup 14-} which are arranged side by side to make a sheet-like arrangement but without linking. The sheets of chains are separated by Eu{sup 2+} atoms and also within the sheet, Eu{sup 2+} atoms fill the spaces between two chains. The chain is made up of homoatomic tetramers (Ga{sub 4}){sup 6+} and dimers (Ga{sub 2}){sup 4+} connected by Sb atoms. The compound is a narrow band-gap semiconductor with E{sub g}{approx}0.6 eV and satisfies the classical Zintl concept. Extended Hueckel 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{sub 7}Ga{sub 6}Sb{sub 8} show that the Eu atoms are divalent and the compound has an antiferromagnetic transition at 9 K.}
doi = {10.1016/j.jssc.2004.04.025}
journal = []
issue = {8}
volume = {177}
journal type = {AC}
place = {United States}
year = {2004}
month = {Aug}
}
title = {Eu{sub 7}Ga{sub 6}Sb{sub 8}: A Zintl phase with Ga-Ga bonds and polymeric gallium antimonide chains}
author = {Park, S -M, Kim, S -J, and Kanatzidis, M G}
abstractNote = {The Zintl phase Eu{sub 7}Ga{sub 6}Sb{sub 8} was obtained from a direct element combination reaction at 900 deg. C. It crystallizes in the orthorhombic space group Pbca (No. 61) with a=15.6470(17) A, b=17.2876(19) A, c=17.9200(19) A, and Z=8. In Eu{sub 7}Ga{sub 6}Sb{sub 8}, the anionic framework forms infinite chains of [Ga{sub 6}Sb{sub 8}]{sup 14-} which are arranged side by side to make a sheet-like arrangement but without linking. The sheets of chains are separated by Eu{sup 2+} atoms and also within the sheet, Eu{sup 2+} atoms fill the spaces between two chains. The chain is made up of homoatomic tetramers (Ga{sub 4}){sup 6+} and dimers (Ga{sub 2}){sup 4+} connected by Sb atoms. The compound is a narrow band-gap semiconductor with E{sub g}{approx}0.6 eV and satisfies the classical Zintl concept. Extended Hueckel 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{sub 7}Ga{sub 6}Sb{sub 8} show that the Eu atoms are divalent and the compound has an antiferromagnetic transition at 9 K.}
doi = {10.1016/j.jssc.2004.04.025}
journal = []
issue = {8}
volume = {177}
journal type = {AC}
place = {United States}
year = {2004}
month = {Aug}
}