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A Vacancy-Driven Intermetallic Phase: Rh3Cd5-δ (δ ∼ 0.56).
Biplab Koley1, Nilanjan Roy1, Harshit1,2
1Department of Chemistry, Indian Institute of Technology (IIT) Kharagpur, Kharagpur 721302, India.
Researchers discovered a new Rhodium-Cadmium (Rh-Cd) phase, Rh3Cd5-δ, near RhCd. This nonstoichiometric compound features a cubic structure with significant vacancies, crucial for its stability.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Rhodium-Cadmium (Rh-Cd) alloys are of interest for their unique structural and electronic properties.
- Understanding nonstoichiometric phases is key to developing novel materials.
Purpose of the Study:
- To characterize a newly identified nonstoichiometric Rh-Cd phase.
- To elucidate the structural and electronic factors governing its stability.
Main Methods:
- Single-crystal X-ray diffraction for structural determination.
- Energy-dispersive X-ray spectroscopy for elemental analysis.
- First-principles electronic structure calculations (DFT) for stability analysis.
Main Results:
- A nonstoichiometric line phase, Rh3Cd5-δ (δ ≈ 0.56), was identified and structurally characterized.
- The compound crystallizes in a cubic Im-3m space group, representing a 2x2x2 superstructure of RhCd.
- Calculations indicate that Rh-Cd heteroatomic interactions and optimal vacancy concentration at the Cd2a site are critical for phase stability.
Conclusions:
- The Rh3Cd5-δ phase is a stable nonstoichiometric compound with a significant vacancy concentration.
- Electronic structure and vacancy concentration are key determinants of stability in this Rh-Cd system.
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