Microstructural Characterization of Ion Implanted Polycrystalline Alumina

Microstructural effects on surface mechanical properties of ion-implanted polymers

Tefzel, a copolymer of tetrafluoroethylene and ethylene, was implanted simultaneously with 400 keV boron, 700 keV nitrogen, and 600 keV carbon to a dose of 3 X 10 ions/cm for each ion. The implanted layer was examined using transmission electron microscope and compared with the pristine Tefzel for microstructural changes. The microhardness of the implanted and pristine Tefzel was determined usi...

Nanopore Characterization and Optical Modeling of Transparent Polycrystalline Alumina

Production of transparent ceramics has become a topic of resurgent interest in recent years, with its promise of near-net shaping appealing to applications ranging from biomedicine to solar energy. However, the mechanisms governing ceramic transparency, translucency, and opaqueness are not entirely understood. Models of both grain boundary and pore scattering have been proposed, but too often w...

Characterization of High-energy Heavy-ion Implanted

BB-65 MeV ion implantation into InP compound semiconductor crystals with 5 MeV nitrogen ions has been investigated. The subsequent characterization was undertaken by a variety of techniques such as nuclear resonant reaction analysis, channeling Rutherford backscattering spectrometry, x-ray rocking curve measurement, and cross-sectional transmission electron microscopy. These techniques have cle...

Grain Boundaries in Polycrystalline Alumina

Microstructural evolution of helium-implanted a-SiC

Helium has a decisive effect on the microstructure of silicon carbide materials after implantation and subsequent annealing. A dense population of bubbles and dislocation loops is already observed at relatively low displacement doses after annealing of helium-implanted a-SiC, while no visible damage appears after irradiation without helium implantation under otherwise equal conditions. The defe...