Browsing by Author "Ellialtioğlu, R."

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    Island ordering on clean Pd(110)
    (American Physical Society, 1993) Hörnis, H.; West, J. R.; Conrad, E. H.; Ellialtioğlu, R.
    High resolution low-energy electron diffraction measurements are reported that demonstrate the existence of semiordered islands on the clean Pd(110) surface. The islands are stable up to 1000 °C and are approximately 90 atoms long in the 001 direction. A simple model is presented that makes use of step-step interactions to generate the periodic island structure. This model predicts that ordered islands form below the roughening temperature if the step creation energy is small compared to the step-step interaction. A justification for this condition is given for the Pd(110) surface. © 1993 The American Physical Society.
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    Temperature-dependent order of clean Pd(110)
    (American Physical Society, 1993) Hörnis, H.; West, J. D.; Conrad, E. H.; Ellialtioğlu, R.
    We report high resolution low-energy-electron-diffraction measurements on the Pd(110) surface. We demonstrate that the clean surface consists of semiordered islands. The island structure is stable up to 650°C at which point the island edges roughen and step-step correlations decrease. Above 1100°C, surface evaporation becomes important and the surface becomes kinetically rough. A simple model is presented that makes use of step-step interactions to generate the periodic island structure. This model predicts that ordered islands form below the roughening temperature if the step creation energy is small compared to the step-step interaction. The existence of isolated steps is shown to be consistent with embedded atom calculations that predict a small step-formation energy on Pd(110) surfaces. © 1993 The American Physical Society.