Wet to Dry Controls Lanthanide Scandate Synthesis.

Area of Science:

• Materials Science
• Nanotechnology
• Computational Chemistry

Background:

• Lanthanide scandate nanoparticles (LnScO3) are crucial for advanced applications.
• Controlling secondary phase formation is essential for high-purity nanoparticle synthesis.
• Water vapor's role in nanoparticle formation requires precise understanding.

Purpose of the Study:

• To develop a method for synthesizing nearly phase-pure lanthanide scandate nanoparticles.
• To investigate the influence of water vapor on nanoparticle growth and phase purity.
• To utilize density functional theory (DFT) for predicting and controlling synthesis conditions.

Main Methods:

• Synthesis of lanthanide scandate nanoparticles (LnScO3) in a water pressure-controlled reactor.
• Application of density functional theory (DFT) to calculate secondary phase formation thermodynamics.
• Experimental validation of DFT predictions across various lanthanides (La, Nd, Sm, Gd).

Main Results:

• Identified optimal low water-vapor partial pressures to inhibit particle growth and prevent secondary phases.
• Determined that optimal humidity for high-purity LnScO3 synthesis varies with the specific lanthanide.
• Achieved phase purity greater than 96 mol % for LnScO3 nanoparticles across the series.

Conclusions:

• DFT-guided control of water vapor pressure is effective for synthesizing phase-pure LnScO3 nanoparticles.
• The developed method allows for quantification of water vapor's role in maintaining phase purity.
• This approach provides a foundation for synthesizing other inorganic perovskite nanoparticles.