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A new rhombohedral modification of EuNi5In.
Inna Bigun1, Volodymyr Smetana, Yaroslav Kalychak
1Department of Analytical Chemistry, Ivan Franko National University of Lviv, Kyryla and Mefodia Str. 6, 79005 Lviv, Ukraine.
A new rhombohedral europium pentanickel indide (r-EuNi(5)In) crystal structure was discovered. This structure, related to the hexagonal form, features complex atomic arrangements and high coordination numbers.
Area of Science:
- Crystallography
- Solid-state chemistry
- Materials science
Background:
- Europium pentanickel indide (EuNi(5)In) exists in different structural modifications.
- Understanding crystal structures is key to predicting material properties.
Purpose of the Study:
- To characterize a novel rhombohedral crystal structure of europium pentanickel indide.
- To compare this new structure with its hexagonal counterpart.
Main Methods:
- Crystallographic analysis
- Space group determination (R ̅3m)
- Structure type identification (UCu(5)In)
Main Results:
- A rhombohedral modification, r-EuNi(5)In, was identified.
- This structure is closely related to the hexagonal h-EuNi(5)In form.
- Both structures comprise CaCu(5)-, MgCu(2)-, and NiAs-type slabs in a 1:2:1 ratio.
- High coordination numbers were observed for europium, indium, and nickel atoms.
- A 2D network of Ni(8) tetrahedral clusters in the ab plane was identified.
Conclusions:
- The rhombohedral structure provides new insights into the Eu-Ni-In system.
- The structural relationship between hexagonal and rhombohedral forms is clarified.
- The complex atomic arrangement suggests potential for unique material properties.
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