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  • 1
    Electronic Resource
    Electronic Resource
    Laser ablative hole formation in amorphous thin films (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 8552-8560 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser ablative hole formation in amorphous Te-Se-I films was studied by microscopy and transient reflectivity measurements. Laser pulses of variable power and length were focused to either 0.8 or 10 μm spots on the films which were deposited on glass and polycarbonate substrates. The important feature of these films was that they did not crystallize upon pulsed laser irradiation. This allowed the examination of dependences on experimental parameters without the complication of phase transitions. The absence of a crystal-melt interface in the films enabled the ablation of holes with exceptionally smooth rims. The experiments confirm that hole formation is by material flow, induced by the laser heating, radially away from the irradiation center. We show that the hole opening is a thermally activated process limited by viscous flow. A barrier of 0.7 eV is derived for the Te-Se-I films. Film viscosity and substrate thermal properties are identified as the key variables by which the dynamics of the process can be affected and the final shape of the hole thereby controlled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353385
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  • 2
    Electronic Resource
    Electronic Resource
    An all-carbon cathode for dc plasma chemical vapor deposition of diamond films (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 943-945 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The fabrication and behavior of an all-carbon cathode for the growth of diamond films by dc discharge plasma chemical vapor deposition is presented. A graphite rod with a diameter of 2.5 mm was passivated in a methane dc plasma. During this process, the graphite was coated with pyrolytic carbon. Simultaneously, a thorn shaped protuberance (hereafter referred to simply as the thorn) of the same material grew from the end face of the rod towards the anode. The pyrolytic carbon prevented excessive sputtering of the cathode during diamond film synthesis in the hydrogen–methane plasma and the thorn presented a pointlike electron emitter providing a stable discharge. Using such cathodes, polycrystalline diamond films with well faceted crystallites have been grown at rates of approximately 5 μm/h. Nucleation and growth of individual, well faceted diamond crystallites even occurred on the cathode. When producing diamond films at methane concentrations above 1 vol %, a tubular form grows on the end of the cathode thorn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144924
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  • 3
    Electronic Resource
    Electronic Resource
    Laser-induced surface structures on diamond films (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 3797-3800 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Periodic ripples are observed to develop at the surface of faceted chemical vapor deposited diamond films during laser irradiation at an angle of incidence beyond a critical value. The grating pattern perpetuates itself across the surface upon irradiation with subsequent, overlapping pulses. The ripples have spacings of typically 10 μm, and are oriented parallel to the plane of incidence, irrespective of the laser wavelength or the polarization. Neither diffraction nor interference effects can therefore be the cause for the rippling. Rather, a shadowing effect appears to initiate the corrugation. The occurrence of permanent ripples poses a limit to the laser polishing of rugged diamond films. However, rippling is avoided and significantly smoother films result (with an average roughness of 33 nm compared to about 100 nm) by rotation of the diamond film during laser processing. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359893
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  • 4
    Electronic Resource
    Electronic Resource
    Stress induced pattern formation preceding crystallization of Te3Se4(I) thin films (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2896-2898 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous Te3Se4 and Te3Se4I thin films, prepared by rf sputtering, were crystallized by thermal treatment. The relaxation of residual stresses upon heating the films produced a macroscopic strain pattern in the amorphous phase prior to crystallization. This pattern determined the growth of a preferred crystallographic orientation which led to the evolution of a macroscopic branching crystalline morphology. Interference of transformation stresses between neighboring surface spherulites (sometimes called cylindrites) resulted in the development of shared morphological domains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110318
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  • 5
    Electronic Resource
    Electronic Resource
    Scattering study of vitrifying Cr-Ti solutions (1992)
    Springer
    Applied physics 54 (1992), S. 26-30 
    Details
    ISSN: 1432-0630
    Keywords: 81.30.Hd ; 61.12.Dw ; 61.55.Hg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The configurations involved in the spontaneous vitrification of quenched Cr-Ti β-phase alloys were investigated by X-ray diffraction and elastic neutron scattering. The two methods yield complementary information: X-rays are sensitive to the topology whereas neutrons emphasize the chemical fluctuations. The results show the presence of two simultaneous but opposing processes, the formation of CsCl-type chemical short range order on one hand and progressive structural disordering on the other. The latter ultimately leads to amorphization. The probable reason for this behavior is that at the temperature in question only the chromium atoms are mobile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348125
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  • 6
    Electronic Resource
    Electronic Resource
    A new membrane tube technique (METT) for continuous gas measurements in soils (1998)
    Springer
    Plant and soil 198 (1998), S. 79-88 
    Details
    ISSN: 1573-5036
    Keywords: membrane tube ; nitric oxide ; radon-222 ; sampling technique ; soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract We present a novel technique for monitoring trace gas concentrations in the air filled pore space of the soil with a high temporal resolution. The method is based on gas diffusing from the air filled pore space into air flowing through an air permeable, hydrophobic, polypropylene tube (Accurel® PP V8/2). Gas permeation efficiencies of the membrane tube were determined for NO, N2O, CO2 and 222Rn in the laboratory. For a length of 1.5 m and flows smaller than 0.8 L min-1, the permeation efficiency was larger than 96%. The effective diffusion coefficients of NO, N2O, CO2 and 222Rn in the membrane are 6.2, 6.6, 5.6 and 6.6 times smaller than the corresponding diffusion coefficients in air, respectively. For tubes shorter than 1.5 m the contribution of pressure gradient induced transport into the membrane tube is below 0.9% of concentration gradient induced transport. Profiles of NO and 222Rn have been measured in the soil of a wheat field. For destructive NO measurements the inlet concentration of the tube was adjusted to the concentrations measured at the outlet whereas for the non-destructive 222Rn measurements the sampled gas was recycled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004277519234
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  • 7
    Electronic Resource
    Electronic Resource
    Lubricated friction of laser micro-patterned sapphire flats (1998)
    Springer
    Tribology letters 4 (1998), S. 237-241 
    Details
    ISSN: 1573-2711
    Keywords: lubricated sliding ; surface pattern ; sliding life ; laser ablation ; sapphire
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The technique of laser ablation was employed to create groove-type patterns of different dimensions on sapphire flats. A thin film of a liquid lubricant was deposited on the patterned surface. Comparative pin-on-disk tests revealed a pronounced effect of the pattern on the tribological characteristics of the flats. The presence of the grooves drastically extended the sliding life. If the grooves were too large, the sliding life was limited by excessive wear of the steel ball, while with sufficiently fine grooves, a steady-state regime with an exceptionally low friction coefficient was approached, after an extended run-in period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019192230095
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  • 8
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    Stress induced pattern formation preceding crystallization of Te3Se4(I) thin films (1993)
    American Institute of Physics
    Details
    Publication Date: 1993-11-22
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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  • 9
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    Morphological modification of TiC by laser irradiation (1991)
    Elsevier
    Details
    Publication Date: 1991-05-01
    Print ISSN: 0257-8972
    Electronic ISSN: 1879-3347
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 10
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    Tribological behaviour of smooth diamond films (1995)
    Elsevier
    Details
    Publication Date: 1995-12-01
    Print ISSN: 0257-8972
    Electronic ISSN: 1879-3347
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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