Disordered LiZnVO(4) with a phenacite structure

Area of Science:

• Solid-state chemistry
• Crystallography
• Materials science

Background:

• Vanadates are a class of inorganic compounds with diverse structural and electronic properties.
• The phenacite structure is known for its unique tetrahedral framework, but disordered variants are less explored.

Purpose of the Study:

• To synthesize and characterize single crystals of lithium zinc vanadate (LiZnVO4).
• To determine the crystal structure and investigate the cation distribution within the vanadate framework.
• To identify novel structural motifs in vanadate compounds.

Main Methods:

• Single crystal growth via the flux method.
• X-ray diffraction analysis to determine crystal structure.
• Bond valence calculations to validate the structural model.

Main Results:

• Successfully grew single crystals of LiZnVO4.
• Identified a three-dimensional network of tetrahedra with one [VO4] and two disordered mixed-site [Li/ZnO4] tetrahedra.
• Observed hexagonal channels along the [0001] direction.
• Confirmed a 1:1 statistical mixture of lithium and zinc on the mixed sites.
• Established LiZnVO4 as the first vanadate with a disordered phenacite structure.

Conclusions:

• The flux method is effective for growing LiZnVO4 single crystals.
• The disordered phenacite structure of LiZnVO4 presents a novel crystallographic arrangement.
• Calculated bond valences support the proposed structural model, confirming cation distribution.