The Local and Electronic Structure Study of LuGd_1-VO₄ (0 ≤ x ≤ 1) Solid Solution Nanocrystals

Area of Science:

• Materials Science
• Solid-State Chemistry
• Nanotechnology

Background:

• Rare-earth-doped mixed crystals are crucial for tunable optical properties.
• Understanding the structural characteristics of mixed-crystal hosts is essential for optimizing material performance.
• LuₓGd₁₋ₓVO₄ solid solutions represent a promising class of materials for advanced applications.

Purpose of the Study:

• To synthesize LuₓGd₁₋ₓVO₄ solid solution nanocrystals.
• To investigate the structural, local, and electronic properties of these nanocrystals.
• To provide insights into the structure-property relationships of mixed-crystal hosts for laser applications.

Main Methods:

• Modified sol-gel method for nanocrystal synthesis.
• X-ray diffraction (XRD) and Rietveld refinement for phase and lattice parameter analysis.
• Extended X-ray absorption fine structure (EXAFS) spectroscopy for local structure determination.
• Core level binding energy analysis and first-principles calculations for electronic structure investigation.

Main Results:

• Successfully synthesized pure crystalline LuₓGd₁₋ₓVO₄ (0 ≤ x ≤ 1) solid solutions following Vegard's law.
• EXAFS revealed decreasing Lu-O bond lengths and fluctuating Gd-O bond lengths with increasing Lu content.
• Electronic structure analysis indicated stable V-O bonds, decreasing Lu-O ionicity, and fluctuating Gd-O ionicity.
• First-principles calculations confirmed valence band contributions and decreasing Lu core/valence level binding energies with increasing Lu content.

Conclusions:

• LuₓGd₁₋ₓVO₄ forms a continuous solid solution with a tetragonal zircon phase.
• The study elucidates the local structural and electronic variations within the solid solution.
• These findings contribute to the understanding of mixed-crystal hosts for improved laser performance through tailored spectral properties.