|About this Abstract
||Materials Science & Technology 2017
||Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
||Evolution of Distinct Phase Composition in TiO2 Thin Films Grown under Electromagnetic Excitation
||Nathan Nakamura, Maxwell W Terban, Simon J.L. Billinge, B. Reeja Jayan
|On-Site Speaker (Planned)
The application of electromagnetic (EM) fields, specifically microwave radiation (MWR), during material synthesis can promote rapid, low temperature material growth. We utilize synchrotron x-ray radiation and the thin film pair distribution function analysis technique (tfPDF) to show that MWR enables single-step synthesis of mixed amorphous-crystalline titanium dioxide (TiO<SUB>2</SUB>) films and achieves crystallinity at significantly reduced reaction temperatures and times. More importantly, our experiments demonstrate that films grown by MWR-assisted synthesis contain a different phase composition and increased crystallinity compared to TiO<SUB>2</SUB> grown at similar temperatures without EM field exposure. MWR-grown films are composed of a mixed-phase structure consisting of long-range anatase TiO<SUB>2</SUB> with short-range amorphous components, while furnace-grown materials are amorphous with local ordering most resembling the brookite phase of TiO<SUB>2</SUB>. These results indicate a clear influence of MWR on lattice formation, and can have important implications for EM field-assisted phase transformations and material growth.