Polygallide RE2MGa9Ge2 (RE = Ce, Sm; M = Ni, Co) phases grown in molten gallium

Marina A. Zhuravleva, Mercouri G Kanatzidis

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Abstract

The quaternary intermetallics Ce2CoGa9Ge2, Ce2NiGa9Ge2, and Sm2NiGa 9Ge2 were prepared by reacting elemental metals in excess of gallium at 850°C. The title compounds crystallize in the tetragonal space group P4/nmm in the Sm2Ni(Si1-xNix)Al 4Si6 structure type with cell parameters a = 5.9582(5) Å, c = 15.0137(18) Å, and a = 5.9082(17) Å, c = 14.919(6) Å, Z = 2, for Ce2CoGa9Ge2 and Sm 2NiGa9Ge2, respectively. The structures are composed of covalently bonded three-dimensional networks of [CoGa 9Ge2] in which the rare-earth metals fill the voids forming a 2D square net. The structures of RE2MGa9Ge 2 are Ga-rich and possess extensive Ga-Ga bonding even though the Ga atoms do not form a network on their own. Magnetic susceptibility measurements for Ce2CoGa9Ge2 and Ce2NiGa 9Ge2 show Curie-Weiss paramagnetism, consistent with presence of Ce3+ ions. Magnetocrystalline anisotropy was observed for Ce2NiGa9Ge2, with the magnetically easy axis lying along the [001] crystallographic direction. A transition to an antiferromagnetic state was observed below 4 K in the easy direction of magnetization. In the magnetically hard direction of the basal plane, paramagnetic behavior was observed down to 1.8 K.

Original languageEnglish
Pages (from-to)9471-9477
Number of pages7
JournalInorganic Chemistry
Volume47
Issue number20
DOIs
Publication statusPublished - Oct 20 2008

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Gallium
gallium
Molten materials
Rare Earth Metals
Paramagnetism
Magnetocrystalline anisotropy
paramagnetism
Magnetic susceptibility
metals
Intermetallics
intermetallics
voids
Magnetization
rare earth elements
Metals
Ions
magnetic permeability
Atoms
magnetization
anisotropy

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Polygallide RE2MGa9Ge2 (RE = Ce, Sm; M = Ni, Co) phases grown in molten gallium. / Zhuravleva, Marina A.; Kanatzidis, Mercouri G.

In: Inorganic Chemistry, Vol. 47, No. 20, 20.10.2008, p. 9471-9477.

Research output: Contribution to journalArticle

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abstract = "The quaternary intermetallics Ce2CoGa9Ge2, Ce2NiGa9Ge2, and Sm2NiGa 9Ge2 were prepared by reacting elemental metals in excess of gallium at 850°C. The title compounds crystallize in the tetragonal space group P4/nmm in the Sm2Ni(Si1-xNix)Al 4Si6 structure type with cell parameters a = 5.9582(5) {\AA}, c = 15.0137(18) {\AA}, and a = 5.9082(17) {\AA}, c = 14.919(6) {\AA}, Z = 2, for Ce2CoGa9Ge2 and Sm 2NiGa9Ge2, respectively. The structures are composed of covalently bonded three-dimensional networks of [CoGa 9Ge2] in which the rare-earth metals fill the voids forming a 2D square net. The structures of RE2MGa9Ge 2 are Ga-rich and possess extensive Ga-Ga bonding even though the Ga atoms do not form a network on their own. Magnetic susceptibility measurements for Ce2CoGa9Ge2 and Ce2NiGa 9Ge2 show Curie-Weiss paramagnetism, consistent with presence of Ce3+ ions. Magnetocrystalline anisotropy was observed for Ce2NiGa9Ge2, with the magnetically easy axis lying along the [001] crystallographic direction. A transition to an antiferromagnetic state was observed below 4 K in the easy direction of magnetization. In the magnetically hard direction of the basal plane, paramagnetic behavior was observed down to 1.8 K.",
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N2 - The quaternary intermetallics Ce2CoGa9Ge2, Ce2NiGa9Ge2, and Sm2NiGa 9Ge2 were prepared by reacting elemental metals in excess of gallium at 850°C. The title compounds crystallize in the tetragonal space group P4/nmm in the Sm2Ni(Si1-xNix)Al 4Si6 structure type with cell parameters a = 5.9582(5) Å, c = 15.0137(18) Å, and a = 5.9082(17) Å, c = 14.919(6) Å, Z = 2, for Ce2CoGa9Ge2 and Sm 2NiGa9Ge2, respectively. The structures are composed of covalently bonded three-dimensional networks of [CoGa 9Ge2] in which the rare-earth metals fill the voids forming a 2D square net. The structures of RE2MGa9Ge 2 are Ga-rich and possess extensive Ga-Ga bonding even though the Ga atoms do not form a network on their own. Magnetic susceptibility measurements for Ce2CoGa9Ge2 and Ce2NiGa 9Ge2 show Curie-Weiss paramagnetism, consistent with presence of Ce3+ ions. Magnetocrystalline anisotropy was observed for Ce2NiGa9Ge2, with the magnetically easy axis lying along the [001] crystallographic direction. A transition to an antiferromagnetic state was observed below 4 K in the easy direction of magnetization. In the magnetically hard direction of the basal plane, paramagnetic behavior was observed down to 1.8 K.

AB - The quaternary intermetallics Ce2CoGa9Ge2, Ce2NiGa9Ge2, and Sm2NiGa 9Ge2 were prepared by reacting elemental metals in excess of gallium at 850°C. The title compounds crystallize in the tetragonal space group P4/nmm in the Sm2Ni(Si1-xNix)Al 4Si6 structure type with cell parameters a = 5.9582(5) Å, c = 15.0137(18) Å, and a = 5.9082(17) Å, c = 14.919(6) Å, Z = 2, for Ce2CoGa9Ge2 and Sm 2NiGa9Ge2, respectively. The structures are composed of covalently bonded three-dimensional networks of [CoGa 9Ge2] in which the rare-earth metals fill the voids forming a 2D square net. The structures of RE2MGa9Ge 2 are Ga-rich and possess extensive Ga-Ga bonding even though the Ga atoms do not form a network on their own. Magnetic susceptibility measurements for Ce2CoGa9Ge2 and Ce2NiGa 9Ge2 show Curie-Weiss paramagnetism, consistent with presence of Ce3+ ions. Magnetocrystalline anisotropy was observed for Ce2NiGa9Ge2, with the magnetically easy axis lying along the [001] crystallographic direction. A transition to an antiferromagnetic state was observed below 4 K in the easy direction of magnetization. In the magnetically hard direction of the basal plane, paramagnetic behavior was observed down to 1.8 K.

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