Quaternary germanides formed in molten aluminum: Tb2NiAl4Ge2 and Ce2NiAl6-xGe4-y (x ∼ 0.24, y ∼ 1.34)

Brad Sieve, Pantelis N. Trikalitis, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The intermetallic phases Tb2NiAl4Ge2 and Ce2NiAl6-xGe4-y (x ∼ 0.24, y ∼ 1.34) were synthesized in molten Al at temperatures below 1000°C. Both compounds adopt the tetragonal space group I4/mmm with cell parameters of a = 4.1346(2) Å c = 19.3437(7) Å for Tb2NiAl4Ge2 and a = 4.1951(9) Å and c = 26.524(7) Å for Ce2NiAl6-xGe4-y. The Tb2NiAl4Ge2 structure features NiAl4Ge2 layers separated by a double layer of rare earth ions. The Ce2NiAl6-xGe4-y (x ∼ 0.24, y ∼ 1.34) structure also contains the NiAl4Ge2 layers along with a vacancy defect PbO-type Al2-xGe2-y layer, and is related to the Ce2NiGa10 structure type. Ordering of vacancies cause the formation of a 3ax3b superstructure in the crystal as seen by electron diffraction experiments. Tb2NiAl4Ge2 exhibits Curie-Weiss paramagnetic behavior with an antiferromagnetic transition observed at ∼20 K. Ce2NiAl6-xGe4-y shows a much more complex magnetic behavior possibly due to temperature induced variation in the valency of the Ce atoms.

Original languageEnglish
Pages (from-to)1568-1574
Number of pages7
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Volume628
Issue number7
DOIs
Publication statusPublished - 2002

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Aluminum
Vacancies
Molten materials
Electron diffraction
Rare earths
Intermetallics
Ions
Atoms
Temperature
Defects
Crystals
Experiments

Keywords

  • Aluminium
  • Crystal structure
  • Germanides (quaternary)
  • Magnetic properties
  • Nickel
  • Rare earth elements

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Quaternary germanides formed in molten aluminum : Tb2NiAl4Ge2 and Ce2NiAl6-xGe4-y (x ∼ 0.24, y ∼ 1.34). / Sieve, Brad; Trikalitis, Pantelis N.; Kanatzidis, Mercouri G.

In: Zeitschrift fur Anorganische und Allgemeine Chemie, Vol. 628, No. 7, 2002, p. 1568-1574.

Research output: Contribution to journalArticle

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AB - The intermetallic phases Tb2NiAl4Ge2 and Ce2NiAl6-xGe4-y (x ∼ 0.24, y ∼ 1.34) were synthesized in molten Al at temperatures below 1000°C. Both compounds adopt the tetragonal space group I4/mmm with cell parameters of a = 4.1346(2) Å c = 19.3437(7) Å for Tb2NiAl4Ge2 and a = 4.1951(9) Å and c = 26.524(7) Å for Ce2NiAl6-xGe4-y. The Tb2NiAl4Ge2 structure features NiAl4Ge2 layers separated by a double layer of rare earth ions. The Ce2NiAl6-xGe4-y (x ∼ 0.24, y ∼ 1.34) structure also contains the NiAl4Ge2 layers along with a vacancy defect PbO-type Al2-xGe2-y layer, and is related to the Ce2NiGa10 structure type. Ordering of vacancies cause the formation of a 3ax3b superstructure in the crystal as seen by electron diffraction experiments. Tb2NiAl4Ge2 exhibits Curie-Weiss paramagnetic behavior with an antiferromagnetic transition observed at ∼20 K. Ce2NiAl6-xGe4-y shows a much more complex magnetic behavior possibly due to temperature induced variation in the valency of the Ce atoms.

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