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Related Experiment Videos

The self-hosting structure of beta-Ta.

Alla Arakcheeva1, Gervais Chapuis, Vladimir Grinevitch

  • 1Institute of Crystallography, University of Lausanne, BSP, 1015 Lausanne, Switzerland.

Acta Crystallographica. Section B, Structural Science
|January 31, 2002
PubMed
Summary

Single crystals of beta-tantalum were synthesized for the first time at normal pressure using electrodeposition. This novel tetragonal structure, beta-Ta, exhibits unique

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Area of Science:

  • Materials Science
  • Crystallography
  • Solid-State Chemistry

Background:

  • Tantalum (Ta) is a critical refractory metal with various allotropes.
  • Previous studies on beta-tantalum often involved high-pressure synthesis.
  • Understanding the crystal structure of tantalum is crucial for its applications.

Purpose of the Study:

  • To synthesize single crystals of beta-tantalum at normal pressure.
  • To characterize the crystal structure and unit-cell parameters of beta-tantalum.
  • To compare the observed structure with known Frank-Kasper and high-pressure phases.

Main Methods:

  • Electrodeposition from a molten fluoride salt bath.
  • Single-crystal X-ray diffraction for structural analysis.
  • Unit-cell parameter determination and space group identification.

Main Results:

  • Successfully obtained single crystals of tetragonal beta-tantalum at normal pressure.
  • Determined unit-cell parameters: a = 10.211(3) Å, c = 5.3064(10) Å, space group P42(1)m.
  • Identified the beta-Ta structure as a sigma-type Frank-Kasper structure with additional intercalated Ta atoms, exhibiting 'self-hosting'.

Conclusions:

  • This study presents the first normal-pressure synthesis of beta-tantalum single crystals.
  • The novel beta-Ta structure shares characteristics with complex high-pressure phases of other elements.
  • The 'self-hosting' feature provides new insights into tantalum's structural behavior.

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