Redetermination of LaZn(5) based on single crystal X-ray diffraction data.

Area of Science:

• Solid State Chemistry
• Crystallography
• Materials Science

Background:

• The binary compound LaZn(5) is known to adopt the CaCu(5) structure type.
• Previous structural studies relied on X-ray powder diffraction data.

Purpose of the Study:

• To redetermine the crystal structure of LaZn(5) using single-crystal X-ray diffraction.
• To investigate the electronic structure and bonding characteristics of LaZn(5).

Main Methods:

• Single-crystal X-ray diffraction
• TB-LMTO-ASA (tight-binding linear muffin-tin orbital atomic spheres approximation) calculations

Main Results:

• The crystal structure of LaZn(5) was refined, revealing anisotropic displacement parameters for all atoms.
• Coordination environments for La and Zn atoms were detailed, including icosahedral coordination for one Zn site.
• Electronic structure calculations indicated positive charge density localized around La atoms and negative charge density around Zn atoms, with weak covalent bonding between Zn atoms.

Conclusions:

• The redetermined crystal structure provides a more accurate description of LaZn(5).
• The electronic structure analysis elucidates the nature of bonding and charge distribution within the compound.