Related Experiment Video
Updated: Sep 18, 2025
08:15
Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
Published on: February 11, 2012
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High-Entropy Germanide (RuRhPdPt)1-xIrxGe: Synthesis, Phase Stability, and Transport Properties
Yuto Muramatsu1, Kengo Miyata1, Daigorou Hirai1
1Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.
Inorganic Chemistry
|June 20, 2025
Summary
This study explores novel germanium-based high-entropy compounds, revealing entropy-driven phase stabilization and disorder effects on transport properties. Superconductivity is suppressed by increasing chemical disorder in these unique materials.
Area of Science:
- Materials Science
- Solid State Physics
- Condensed Matter Physics
Background:
- High-entropy compounds (HECs) exhibit unique properties due to the 'cocktail effect'.
- Germanium-based high-entropy compounds (HEGs) are an underexplored class of HECs.
Purpose of the Study:
- Synthesize and investigate the structural and transport properties of (RuRhPdPt)1-xIrxGe HEGs.
- Explore entropy-driven phase stabilization and the impact of chemical disorder on material properties.
Main Methods:
- Synthesis of (RuRhPdPt)1-xIrxGe with varying Ir content (0.2 ≤ x ≤ 1).
- X-ray diffraction for structural analysis.
- Transport measurements (resistivity, Hall effect) and annealing temperature control.
Main Results:
- Formation of a single-phase MnP-type (Pnma) structure stabilized by entropy across the composition range.
- Temperature-independent resistivity for x ≤ 0.6, indicating significant electron scattering due to disorder.
- Observation of superconductivity in IrGe (x=1), suppressed by increasing disorder, suggesting breakdown of superconducting coherence.
Conclusions:
- Successful expansion of high-entropy materials into germanide systems.
- Demonstration of entropy's role in stabilizing phases and disorder's impact on electronic properties.
- Findings pave the way for designing novel high-entropy materials with tunable functionalities.
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