Electronic Conductivity of A-Site-Deficient and n-/p-Modified Strontium Titanate Nanoparticles Synthesized Using the...

Area of Science:

• Materials Science
• Solid State Chemistry
• Nanotechnology

Background:

• Strontium titanate (SrTiO3) is a versatile perovskite oxide with potential in electronics.
• Conventional synthesis methods for modified SrTiO3 can be complex and limited in scope.
• Tuning the electronic properties of SrTiO3 is crucial for advanced applications.

Purpose of the Study:

• To develop a versatile and efficient method for synthesizing A-site-deficient and modified SrTiO3 nanoparticles.
• To explore the use of acetylacetonate and alkoxide precursors in a continuous solvothermal process.
• To investigate the impact of A- and B-site modifications on the microstructure and electronic conductivity of SrTiO3.

Main Methods:

• One-step supercritical continuous solvothermal synthesis.
• Utilized acetylacetonate and alkoxide precursors for cation sources.
• Synthesized and characterized phase-pure SrTiO3 nanoparticles with various rare-earth and transition metal dopants (Y, Nd, Nb, Fe).
• Processed dense pellets for electronic conductivity measurements.

Main Results:

• Successfully synthesized A-site-deficient (∼15%) and modified SrTiO3 nanoparticles.
• Demonstrated the versatility of the continuous solvothermal setup and acetylacetonate chemistry for broad material modifications.
• Elucidated the impact of n- and p-type doping on the lattice structure.
• Achieved up to a 1000-fold increase in electronic conductivity (up to 1 S cm⁻¹ at 1000 K) compared to conventional SrTiO3.

Conclusions:

• The supercritical continuous solvothermal method is effective for producing modified SrTiO3 nanoparticles with tunable properties.
• Atomic modification of the perovskite structure significantly enhances electronic conductivity.
• This approach offers a promising route for developing advanced electronic materials based on strontium titanate.