Disentangling Structural Patterns in Quaternary Germanides with Materials Informatics and Exploratory Synthesis:...

Area of Science:

• Materials Science
• Solid State Chemistry
• Crystallography

Background:

• Intermetallic germanides offer structural diversity and potential applications.
• Quaternary germanide exploration is advancing beyond binary and ternary systems.
• Thermodynamic competition between quaternary phases complicates synthesis.

Purpose of the Study:

• Expand the quaternary germanide series RE4IrInGe4.
• Investigate bonding trends and structure formation mechanisms.
• Develop methods to differentiate related quaternary structure types.

Main Methods:

• Arc-melting synthesis followed by annealing.
• Electronic structure calculations for key compounds.
• Partial Least Squares Discriminant Analysis (PLS-DA) for structure classification.
• Materials informatics tools for structural evolution analysis.

Main Results:

• Successfully synthesized the RE4IrInGe4 series (RE = Y, Ce-Nd, Sm, Gd, Ho-Er).
• Identified Ce-Ge bonding as a critical interaction alongside Ir-Ge bonding.
• Developed a structure map distinguishing Tb4RhInGe4-type from Ho4Ni2InGe4-type phases.
• Element radii and valence electron counts are key discriminators for these structure types.

Conclusions:

• Ce-Ge bonding significantly influences quaternary germanide structure and RE series limitations.
• PLS-DA provides an effective method for classifying related quaternary germanide structures.
• Materials informatics analysis offers insights into structural evolution and coordination mechanisms.