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The Missing Link in the Monogermanide Series: YbGe.

Julia-Maria Hübner1, Riccardo Freccero2, Yurii Prots3

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Researchers synthesized the final missing rare-earth metal monogermanide, Ytterbium Germanide (YbGe), under high pressure and temperature. This new compound exhibits a unique crystal structure and chemical bonding, bridging known monogermanide types.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Rare-Earth Chemistry

Background:

  • Monogermanides are binary compounds containing one germanium atom per formula unit.
  • Rare-earth metal monogermanides are of interest due to their diverse structural and electronic properties.
  • The monogermanide of Ytterbium (YbGe) was previously uncharacterized.

Purpose of the Study:

  • To synthesize and characterize the missing rare-earth metal monogermanide, Ytterbium Germanide (YbGe).
  • To determine the crystal structure and chemical bonding of YbGe.
  • To understand the position of YbGe within the broader context of rare-earth metal monogermanides.

Main Methods:

  • High-pressure, high-temperature synthesis.
  • Powder X-ray diffraction.
  • Single-crystal X-ray diffraction.
  • Chemical bonding analysis.

Main Results:

  • YbGe was successfully synthesized at 12 GPa and 750–1000 °C.
  • The compound crystallizes in the FeB-type structure (space group Pnma).
  • Lattice parameters were determined: a=7.901(2) Å, b=3.8981(9) Å, c=5.873(2) Å.
  • Evidence of polyanionic Germanium (Ge) chains interacting with Ytterbium (Yb) via polar bonds was found.

Conclusions:

  • YbGe represents the final missing member of the rare-earth metal monogermanide series.
  • The crystal structure and bonding of YbGe suggest a transitional chemical bonding scenario.
  • This finding helps elucidate the trends in chemical bonding across rare-earth metal monogermanides.