Crystal structure of Ba5In4Sb6.

Area of Science:

• Solid-state chemistry
• Inorganic materials science
• Crystallography

Background:

• Understanding complex inorganic compounds is crucial for materials discovery.
• Layered structures often exhibit unique electronic and physical properties.
• Barium, indium, and antimony compounds are of interest for potential applications.

Purpose of the Study:

• To synthesize and characterize a novel barium-indium-antimony compound.
• To elucidate the crystal structure and coordination environment of the title compound.
• To investigate the structural features of layered inorganic materials.

Main Methods:

• Indium-flux synthesis technique.
• Single-crystal X-ray diffraction for structural determination.
• Analysis of coordination geometries and crystallographic symmetry.

Main Results:

• Successful synthesis of penta-barium tetra-indium hexa-antimony (Ba5In4Sb6).
• The structure consists of edge-sharing In2Sb6 units forming layers.
• Barium cations occupy voids between layers, displaying bicapped octahedral or triangular prismatic coordination with antimony.
• Multiple crystallographic sites for barium ions were identified, with varying symmetries.

Conclusions:

• The indium-flux method is effective for synthesizing complex barium-indium-antimony phases.
• The layered structure with interstitial barium cations provides a new structural motif in intermetallic compounds.
• Detailed crystallographic analysis reveals the intricate arrangement and coordination of atoms in Ba5In4Sb6.