EFFECTS OF DOPING AND DEFECTS IN BaSnO3 AND COVETIC ALLOYS

Simple item page
dc.contributor.advisorTakeuchi, Ichiroen_US
dc.contributor.advisorSalamanca-Riba, Lourdes G.en_US
dc.contributor.authorJaim, H. M. Iftekharen_US
dc.contributor.departmentMaterial Science and Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2018-07-17T05:53:19Z
dc.date.available2018-07-17T05:53:19Z
dc.date.issued2018en_US
dc.description.abstractDoping and defects have played major roles for optimizing the structural, electrical, optical and mechanical properties of materials over the centuries. With the advent of modern fabrication and characterization tools, we are engineering materials by modifying the fundamental structure at the nano-scale. Such research and innovations are necessary to find alternatives of the known materials to meet technological, economic and environmental challenges. In this dissertation, we will discuss two classes of materials to identify the effects of atomic level engineering on the enhanced properties of Covetic alloys and BaSnO3 perovskites. The first part of the thesis is based on the nanoscale and surface characterizations of the carbon doped metal alloys of aluminum and silver produced by the Covetic process. We have found the presence of sp2 bonded 3D epitaxial carbon in graphene nano-ribbon form on the aluminum and silver atomic planes. Such directional presence of sp2 carbon in the crystalline form along with other allotropes will be studied. Here, we have detailed the bonding, strain, defect concentrations, and oxidation characteristics of these compositions, and distinguished Covetic materials from other carbon based composites. Covetic process is significant as it defies the traditional metal-carbon phase diagrams under non-equilibrium conditions. The second part of the dissertation focuses on the BaSnO3, a major candidate in s-band electronics and transparent conducting oxide industry. Here, we will demonstrate the role of oxygen vacancies for inducing high conductivity in the BaSnO3 thin films from insulating state and their stability on single crystal substrates deposited by pulsed laser deposition. To further investigate the role of multi-valent rare earth element doping on optical and electronic properties, results of Lead (Pb), Bismuth (Bi) and Strontium (Sr) substitution by combinatorial synthesis of BaSnO3 are presented. We have tuned the bandgap from 3 to 4 eV based on the substitutions, and observed clustering and in-gap states for Pb and Bi-substitutions, respectively. Lastly, experiments regarding the search of the BaSnO3 based superconductors by carrier injection, multi-valent states and strain engineering will be discussed.en_US
dc.identifierhttps://doi.org/10.13016/M2JW86R1F
dc.identifier.urihttp://hdl.handle.net/1903/20861
dc.language.isoenen_US
dc.subject.pqcontrolledMaterials Scienceen_US
dc.subject.pqcontrolledCondensed matter physicsen_US
dc.subject.pqcontrolledChemistryen_US
dc.subject.pquncontrolledCarbon Nanostructure in aluminumen_US
dc.subject.pquncontrolledsilver metalen_US
dc.subject.pquncontrolledoxygen deficeint & doped BaSnO3en_US
dc.subject.pquncontrolledPben_US
dc.subject.pquncontrolledBi and Sr doping for optical bandgapen_US
dc.subject.pquncontrolledPerovskite insulator-conducting transitionen_US
dc.subject.pquncontrolledSearch for superconductivityen_US
dc.subject.pquncontrolledTEMen_US
dc.subject.pquncontrolledEELSen_US
dc.subject.pquncontrolledXPSen_US
dc.subject.pquncontrolledEPMAen_US
dc.titleEFFECTS OF DOPING AND DEFECTS IN BaSnO3 AND COVETIC ALLOYSen_US
dc.typeDissertationen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Jaim_umd_0117E_18836.pdf
Size:
5.13 MB
Format:
Adobe Portable Document Format
Download

Collections

UMD Theses and Dissertations
Materials Science & Engineering Theses and Dissertations