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HoHO: A Paramagnetic Air-Resistant Ionic Hydride with Ordered Anions.

Nicolas Zapp1, Denis Sheptyakov2, Alexandra Franz3

  • 1Inorganic Chemistry, Leipzig University, Johannisallee 23, 04103 Leipzig, Germany.

Inorganic Chemistry
|March 3, 2021
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Summary
This summary is machine-generated.

Researchers synthesized holmium hydride oxide (HoHO), a rare functional material. This novel oxyhydride exhibits remarkable thermal stability and unique optical properties, opening new avenues in materials science.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Inorganic chemistry

Background:

  • Metal oxides can be modified by substituting oxygen with hydrogen to create hydride oxides (oxyhydrides).
  • Oxyhydrides are scarce but possess potential as functional materials.
  • Holmium hydride oxide (HoHO) is a novel material in this class.

Purpose of the Study:

  • To synthesize and characterize holmium hydride oxide (HoHO).
  • To investigate its crystallographic, optical, thermal, and magnetic properties.

Main Methods:

  • Synthesis via reaction of Ho₂O₃ with HoH₃ or CaH₂.
  • Characterization using powder X-ray and neutron powder diffraction.
  • Analysis of optical properties (Alexandrite effect).
  • Thermal stability and air inertness testing.
  • Magnetic susceptibility measurements.

Main Results:

  • HoHO was successfully synthesized with the stoichiometric composition HoHO.
  • It crystallizes in an ordered fluorite superstructure (F4̅3m) with significant ionic bonding.
  • The material displays an Alexandrite effect (yellow in sunlight, pink in artificial light).
  • HoHO shows high thermal stability (stable up to 540 K) and air inertness.
  • It is paramagnetic with a magnetic moment of 10.41(2) μB, with no magnetic ordering down to 2 K.

Conclusions:

  • Holmium hydride oxide (HoHO) is a newly synthesized oxyhydride with a unique structure and properties.
  • Its stability and optical characteristics make it a promising functional material.
  • This study provides the first example of a hydride oxide with considerable ionic bonding in this structure type.