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Pressure-Induced Structural Stabilities and Superconductivity in Rhodium Borides
Junyi Du1, Weiguo Sun2, Xiaofeng Li2
1College of Mathematical Sciences, Luoyang Normal University, Luoyang 471934, China.
Researchers discovered new Rhodium-Boron (Rh-B) compounds with potential for superconductivity. These boron-rich phases, identified under high pressure, show metallic properties and predicted critical temperatures (Tc) up to 9.36 K.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Chemistry
Background:
- Transition metal borides are known for superconductivity and hardness.
- Rhodium-Boron (Rh-B) compounds are of significant research interest.
Purpose of the Study:
- To investigate stable crystal structures of Rh-B compounds under high pressure.
- To identify new Rh-B phases and characterize their properties.
Main Methods:
- First-principles structural searching was employed to explore Rh-B phase space.
- Elastic property assessments and phonon dispersion calculations validated stability.
- Electronic density of states were analyzed to predict superconducting behavior.
Main Results:
- Three new boron-rich Rh-B phases (C2/m-RhB6, Amm2-RhB6, Cmca-RhB8) were identified.
- These phases feature 3D covalent bonding networks but possess low mechanical moduli.
- Predicted superconducting transition temperatures (Tc) of 8.93 K (Amm2-RhB6) and 9.36 K (Cmca-RhB8) at 100 GPa were calculated.
Conclusions:
- New Rh-B phases were discovered with potential superconducting properties.
- These materials are not candidates for superhard applications.
- The findings contribute to understanding structure-property relationships in transition metal borides.
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