Showing papers by "Péter B. Barna published in 1987"
TL;DR: In this paper, Bilayer and multilayer thin-film systems of Al-Mn were evaporated onto carbon foils prepared on Mo grids, and heat treatments were carried out in situ in a highvoltage electron microscope equipped with an ultrahigh vacuum specimen chamber.
Abstract: Bilayer and multilayer thin‐film systems of Al–Mn were evaporated onto carbon foils prepared on Mo grids. The Al/Mn ratios were chosen to provide enough Mn for the second phase formation. Heat treatments were carried out in situ in a high‐voltage electron microscope equipped with an ultrahigh vacuum specimen chamber. The appearance, growth, and transformation of the intermetallics were directly observed and studied by electron diffraction. Beside the crystalline phases the quasicrystalline i and T phases were also produced. The connection between the layer structures and the types of the intermetallics formed in the course of the heat treatments are shown.
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01 Jan 1987-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this paper, the depth distribution, the structure and the formation of radiation damage caused by helium implantation in (100) silicon at different implantation temperatures and at different doses up to the critical dose for flaking, TEM and proton channeling investigations were done.
Abstract: To study the depth distribution, the structure and the formation of radiation damage caused by helium implantation in (100) silicon at different implantation temperatures and at different doses up to the critical dose for flaking, TEM and proton channeling investigations were done. The phases were identified by electron diffraction. The resulting damage structures and distribution were found to be sensitive functions of substrate temperature. At room temperature the disorder was observed as a narrow distribution of extended defects at the projected ion range, but the tail of this distribution extended to the surface. For 300 and 570°C irradiation the silicon preserved its single crystalline structure between the surface layer and the damaged zone up to the critical dose. The number of point defects and amorphous clusters decreased at the projected ion range with increasing implantation temperature and helium bubbles were formed at the same time.
7 citations
TL;DR: In this article, the early stages of SiO x film formation were studied on NaCl (100) surfaces by evaporating SiO. The selective nucleation of SiOs on the surface defects resulted in decoration patterns by developing three-dimensional SiOx grains.
3 citations
TL;DR: In this article, the effect of oxygen on the structural development of evaporated copper films was studied, which revealed a correlation of the surface growth morphology and the grain size distribution to the partial pressure of oxygen and the film thickness.
2 citations
TL;DR: A polytetrahedral, sequentially grown model under a variety of physical assumptions was devised in this article for understanding structural pecularities in amorphous discontinuous films, in comparison with the more equilibrated glassy systems.
Abstract: A polytetrahedral, sequentially-grown model under a variety of physical assumptions was devised, which seems particularly suitable for understanding structural pecularities in amorphous discontinuous films, in comparison with the more equilibrated glassy systems.
1 citations
TL;DR: In this paper, the results obtained show a much more detailed picture (regarding elemental and molecular composition as well as morphology) compared to routine monitoring by chemical methods, and the case of sulphur adsorbed on different (metal) surfaces sulphide was found to be dominating, contrary to the results of an earlier XPS analysis of aerosol ejected by a coal-fired power plant.
1 citations