The composition and atomic depth distributions of ultrathin zirconia films (;30 Å ) deposited on Si~100! have been investigated using medium-energy ion scattering ~MEIS!. Reoxidation in O2 permits the oxygen incorporation, exchange, and mobility to be followed due to the isotope sensitivity of the MEIS technique. These quantitative studies showed that significant interfacial SiO2 growth results...

We have studied an alumina/zirconia interface using the all-electron projector augmented wave formalism within density functional theory. We present the electronic, structural, and energetic properties of the ZrO2(001)/a-Al2O3(11̄02) interface as well as of the free a-Al2O3(11̄02) and ZrO2(001) surfaces. We find that the generalized gradient correction significantly lowers the oxide surface energ...

Zirconia (ZrO2) is a commonly used ceramic which is known for its thermal and mechanical resistance and its radiation hardness. Because of these properties it is often used as inert fuel matrix in nuclear reactors [1]. At ambient conditions the material is in its monoclinic form which it changes to tetragonal at ~ 1200°C and to cubic at ~2400°C. High pressure forms are known to be orthorhombic....

PURPOSE To retrospectively evaluate the clinical performance of zirconia endosseous implants. MATERIALS AND METHODS Partially edentulous patients with adequate bone volume to fit yttria tetragonal zirconia polycrystal (Y-TZP) implants at least 3.5 mm wide and 8.0 mm long were included. Full-mouth probing pocket depth (PPDs) and percentage bleeding on probing (BOP) scores around teeth and impl...

The aim of this investigation was to determine the influence of simulated ageing on the tetragonal-to-monoclinic phase transformation and on the flexural strength of a 3Y-TZP ceramic, compared to alumina toughened zirconia (ATZ) and ceria-stabilized zirconia (12Ce-TZP). Standardized disc specimens of each material were hydrothermally aged in steam at 134°C and 3bar for 0, 16, 32, 64 or 128h. Th...