Doctor of Philosophy
Engineering Materials Institute
Chowdhury, Azrin Akhter, Synthesis of nano-ceramics for supercapacitors, Doctor of Philosophy thesis, Engineering Materials Institute, University of Wollongong, 2014. http://ro.uow.edu.au/theses/4314
Cross-disciplinary research into the development of nanomaterials and nanotechnologies for energy storage systems is one of the most dynamic areas of current research and technology. This investigation focused on the synthesis of complex oxide nano-ceramics with dielectric constants, using a new and costeffective material and fabrication technology described as Electric Discharge Assisted Mechanical Milling (EDAMM). This technique utilises a novel chemical reactor which combines mechanical milling and transferred arc plasma processing for the reactive processing of powders under a controlled atmosphere. This technique was used in this doctoral work to synthesise different types of complex nanoceramics including; magnesium aluminium iron oxide (MgAl2O4), calcium copper titanium oxide CaCu3Ti4O12 (CCT), barium lanthanum titanium oxide BaLa2Ti4O12 (BLT) and bismuth titanium iron oxide Bi5Ti3FeO15 (BTF). The processed samples were then pressed into pellets and heat-treated in air to produce recrystallised microstructures with good dielectric properties. The microstructures were studied using X-ray diffraction (XRD), FESEM, Transmission Electron Microscopy (TEM) and Energy-Dispersive X-ray Spectroscopy (EDS) analysis, while the dielectric properties were examined on an LCR meter. Dielectric measurements were performed on pressed and sintered samples using an LCR meter.