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  • Articles  (15)
  • Articles: DFG German National Licenses  (15)
  • 2010-2014
  • 1995-1999  (6)
  • 1915-1919  (9)
  • Chemistry and Pharmacology  (9)
  • Physics  (6)
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  • Articles  (15)
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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 46-48 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Six different types of boron nitride films were investigated by polarized infrared reflection spectroscopy. Films with a highly cubic, mixed cubic and noncubic, and exclusively noncubic phase composition were synthesized using ion beam assisted deposition. Additionally, postdeposition argon ion irradiated cubic and noncubic boron nitride films as well as a nitrogen implanted boron sample were analyzed. Using this technique, besides the cubic phase, two different noncubic modifications, layered anisotropic and amorphous, could be distinguished. A preferential orientation of the normal axis of the sp2-bonded basal planes parallel to the substrate surface was observed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1951-1953 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Al/AlN multilayered thin films with periodic thickness λ less than 24 nm were developed by ion beam assisted deposition. A considerably small surface roughness comparable to that of the silicon substrate and much smaller than those of both monolithic Al and AlN films was obtained. Over the investigated range of λ, all the multilayers are harder than the homogeneous AlN film, and a significant hardness enhancement by a factor of ∼2 over that of the AlN film was observed in the multilayer with λ of 6 nm. Moreover, the hardness enhancement is not at the expense of the multilayer toughness, with the multilayer Al/AlN films showing improved plasticity as compared with the AlN film. © 1997 American Institute of Physics.
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1851-1853 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Metals that form dense native surface oxide layers challenge plasma diffusion treatment techniques. Experimental results obtained during nitriding of stainless steel from real-time depth-resolved compositional analysis by elastic recoil detection give insight into the transport kinetics. In agreement with semiquantitative considerations on the oxide removal and the oxide growth, the interplay of sputtering and oxidation emerges as a key parameter. On this background, suggestions for practical applications and optimization of the modification processes are given for different plasma diffusion treatment techniques. © 1999 American Institute of Physics.
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  • 4
    ISSN: 1432-0630
    Keywords: PACS: 68.55.-a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Fe/Al multilayers are prepared by crossed-beam pulsed laser deposition and investigated by Rutherford backscattering, conversion electron Mössbauer spectroscopy, and transmission electron microscopy. The results are compared to purely ballistic simulations of the deposition process using the TRIDYN4.0 code. It is found that the intermixing of adjacent layers must be described in terms of ballistic mixing followed by chemical mixing. The phase formation in the transition layer between adjacent layers follows the non-equilibrium behavior of Fe/Al in analogy to investigations on mechanically alloyed and ion-beam-mixed Fe/Al. In Fe-rich areas a bcc solid solution is formed. In Al-rich environment an amorphous phase is observed.
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  • 5
    ISSN: 1432-0630
    Keywords: PACS: 81.40; 61.80; 62
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 3 N4 ceramic after chromium implantation were investigated for the dependence on implantation energy between 200 keV and 3 MeV at a fixed fluence of 1017 ions/cm2. The wear of the modified material is reduced for a load of 2 N independent of ion energy accompanied by a slight increase of the friction coefficient. At higher loads only high-energy implantations result in improved wear behaviour. Structural investigations show the absence of any new phases formed by ion implantation. All energies result in an amorphous layer. For lower energies this amorphous layer reaches up to the surface whereas at higher energies it is covered by still-crystalline but damaged material. The observed wear behaviour can be explained with the amorphization of the near surface region and the stress generated by the volume swelling of the amorphous layer.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 22 (1918), S. 155-163 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 25 (1919), S. 101-109 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zusammenfassung Die bei der Diffusion von Natronlauge in mit Formaldehyd gegerbten Gelatine-Chlornatrium-Gallerten entstehenden Schrumpfungs-Strukturen sind auf innere strukturelle Veränderungen der Mizellarverbände der Gallerte zurückzuführen. Das in dünner Schicht im voraus gegerbte Häutchen der Gallerte schmiegt sich dabei eng den inneren groben Strukturelementen an und folgt vollständig den Richtungen, welche den gröberen inneren Strukturbildungen zugrunde liegen. Bei Spannungen entstehen demnach radial nach dem Diffusionszentrum zu gerichtele Schrumpfungslinien und bei Zusammenziehung der Mizellarverbände entstehen konzentrische Ringsysteme. Abweichungen und Strukturstörungen innerhalb dieser Schrumpfungs-Struktursysteme können durch winzige, aus den feinen Poren der Oberfläche des Häutchens austretende Natronlaugetröpfchen verursacht werden, indem diese als selbständige Diffusionszentren nicht nur sich gegenseitig, sondern auch bereits vorhandene Diffusionsfelder beeinflussen. Aber auch diejenigen inneren Teile, die zu diesen neuen Diffusionszentren gehören, unterliegen denselben Gesetzen struktureller Veränderung wie das Hauptdiffusionszentrum.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 23 (1918), S. 11-15 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 25 (1919), S. 67-74 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zusammenfassung Die Kristallisations-Erscheinungen in der Formaldehyd-Gelatine-Gallerte sind auf die orientierenden Einflüsse der Formaldehyd-Kondensation und Polymerisations-Produkte auf die Mizellen der α-Gelatine zurückzuführen. Bei den beobachteten kugelförmigen Kristallbildungen ist die Lage der einzelnen Mizellen eine radiale in Form von konzentrischen Kugelschalen, und verhält sich dementsprechend das Gebilde optisch genau so wie ein Kristalltropfen. Die zahlreichen hiervon abweichenden Formen kommen durch Deformation infolge Spannungs-Erscheinungen während des Eintrocknens der Gallerte zustande, wobei die Anordnung der Mizellen sich mehr und mehr der fibrillaren Struktur nähert. Dieselbe fibrillare Struktur besitzen auch die bei abweichender Versuchsanordnung erhaltenen Sphärokristalle.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 19 (1916), S. 213-219 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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